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Artykuły w czasopismach na temat „Ionization bubbles”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Danehkar, A., M. S. Oey, and W. J. Gray. "Numerical Modeling of Galactic Superwinds with Time-evolving Stellar Feedback." Proceedings of the International Astronomical Union 17, S370 (2021): 217–22. http://dx.doi.org/10.1017/s1743921323000066.

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AbstractMass-loss and radiation feedback from evolving massive stars produce galactic-scale superwinds, sometimes surrounded by pressure-driven bubbles. Using the time-dependent stellar population typically seen in star-forming regions, we conduct hydrodynamic simulations of a starburst-driven superwind model coupled with radiative efficiency rates to investigate the formation of radiative cooling superwinds and bubbles. Our numerical simulations depict the parameter space where radiative cooling superwinds with or without bubbles occur. Moreover, we employ the physical properties and time-dep

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Dwarkadas, Vikram V. "On the Evolution of, and Hot Gas in, Wind-Blown Bubbles around Massive Stars - Wind Bubbles Are Not Energy-Conserving." Galaxies 11, no. 3 (2023): 78. http://dx.doi.org/10.3390/galaxies11030078.

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The structure and evolution of wind-blown bubbles (WBBs) around massive stars has primarilybeen investigated using an energy-conserving model of wind-blown bubbles. While this model is useful in explaining the general properties of the evolution, several problems remain, including inconsistencies between observed wind luminosities and those derived using this formulation. Major difficulties include the low X-ray temperature and X-ray luminosity, compared to the model. In this paper, we re-examine the evolution, dynamics, and kinematics of WBBs around massive stars, using published ionization g

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3

Bolotnova, R. Kh. "Wide-range equations of state for organic liquids." Proceedings of the Mavlyutov Institute of Mechanics 5 (2007): 113–20. http://dx.doi.org/10.21662/uim2007.1.011.

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The method of construction the wide-range equations of state for organic liquids, describing the gas and liquid phases including dissociation and ionization which occurs during an intense collapse of steam bubbles and accompanied by ultra-high pressures and temperatures, is proposed.

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4

Xu, Yidong, Bin Yue, and Xuelei Chen. "The Neutral Islands during the Late Epoch of Reionization." Proceedings of the International Astronomical Union 12, S333 (2017): 64–67. http://dx.doi.org/10.1017/s174392131701153x.

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AbstractThe large-scale structure of the ionization field during the epoch of reionization (EoR) can be modeled by the excursion set theory. While the growth of ionized regions during the early stage are described by the “bubble model”, the shrinking process of neutral regions after the percolation of the ionized region calls for an “island model”. An excursion set based analytical model and a semi-numerical code (islandFAST) have been developed. The ionizing background and the bubbles inside the islands are also included in the treatment. With two kinds of absorbers of ionizing photons, i.e.

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5

Soria, R., M. W. Pakull, C. Motch, et al. "The ultraluminous X-ray source bubble in NGC 5585." Monthly Notices of the Royal Astronomical Society 501, no. 2 (2020): 1644–62. http://dx.doi.org/10.1093/mnras/staa3784.

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ABSTRACT Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources. We illustrate the most recent addition to this class: a huge (350 pc × 220 pc in diameter) bubble around a ULX in NGC 5585. We modelled the X-ray properties of the ULX (a broadened-disc source with LX ≈ 2–4 × 1039 erg s−1) from Chandra and XMM–Newton, and identified its likely optical counterpart in Hubble Space Telescope images. We used the Large Binocular T

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6

Kutovyi, Volodymyr. "Thermal Vacuum Process of Dispersing Heterogeneous Materials." American Journal of Physics and Applications 13, no. 3 (2025): 59–67. https://doi.org/10.11648/j.ajpa.20251303.12.

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The presented work examines physical processes in a thermal vacuum installation, which allow for the effective dispersion of heterogeneous materials within 15 seconds. An analysis of heat and mass transfer processes that affect the dispersion of heterogeneous materials been carried out. Calculations of the speed, frequency and wavelength in spiral heating element of the thermal vacuum installation been made for different angles of motion of material particles. It been established that the speed of motion of a material particle in the cavity of the heating element can be more than a thousand ki

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7

Yasui, Kyuichi. "Multibubble Sonoluminescence from a Theoretical Perspective." Molecules 26, no. 15 (2021): 4624. http://dx.doi.org/10.3390/molecules26154624.

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In the present review, complexity in multibubble sonoluminescence (MBSL) is discussed. At relatively low ultrasonic frequency, a cavitation bubble is filled mostly with water vapor at relatively high acoustic amplitude which results in OH-line emission by chemiluminescence as well as emissions from weakly ionized plasma formed inside a bubble at the end of the violent bubble collapse. At relatively high ultrasonic frequency or at relatively low acoustic amplitude at relatively low ultrasonic frequency, a cavitation bubble is mostly filled with noncondensable gases such as air or argon at the e

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8

Dwarkadas, Vikram V. "Ionization-Gasdynamic Simulations of Wind-Blown Nebulae around Massive Stars." Galaxies 10, no. 1 (2022): 37. http://dx.doi.org/10.3390/galaxies10010037.

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Using a code that employs a self-consistent method for computing the effects of photo-ionization on circumstellar gas dynamics, we model the formation of wind-driven nebulae around massive stars. We take into account changes in stellar properties and mass-loss over the star’s evolution. Our simulations show how various properties, such as the density and ionization fraction, change throughout the evolution of the star. The multi-dimensional simulations reveal the presence of strong ionization front instabilities in the main-sequence phase, similar to those seen in galactic ionization fronts. H

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9

Medling, Anne M., Lisa J. Kewley, Daniela Calzetti, et al. "Tracing the Ionization Structure of the Shocked Filaments of NGC 6240." Astrophysical Journal 923, no. 2 (2021): 160. http://dx.doi.org/10.3847/1538-4357/ac2ebb.

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Abstract We study the ionization and excitation structure of the interstellar medium in the late-stage gas-rich galaxy merger NGC 6240 using a suite of emission-line maps at ∼25 pc resolution from the Hubble Space Telescope, Keck/NIRC2 with Adaptive Optics, and the Atacama Large Millimeter/submillimeter Array (ALMA). NGC 6240 hosts a superwind driven by intense star formation and/or one or both of two active nuclei; the outflows produce bubbles and filaments seen in shock tracers from warm molecular gas (H2 2.12 μm) to optical ionized gas ([O iii], [N ii], [S ii], and [O i]) and hot plasma (Fe

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10

Gorce, Adélie, and Jonathan R. Pritchard. "Studying the morphology of reionization with the triangle correlation function of phases." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 1321–37. http://dx.doi.org/10.1093/mnras/stz2195.

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ABSTRACT We present a new statistical tool, called the triangle correlation function (TCF), inspired by the earlier work of Obreschkow et al. It is derived from the three-point correlation function and aims to probe the characteristic scale of ionized regions during the epoch of reionization from 21cm interferometric observations. Unlike most works, which focus on power spectrum, i.e. amplitude information, our statistic is based on the information we can extract from the phases of the Fourier transform of the ionization field. In this perspective, it may benefit from the well-known interferom

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11

Jung, Intae, Steven L. Finkelstein, Pablo Arrabal Haro та ін. "CEERS: Diversity of Lyα Emitters during the Epoch of Reionization". Astrophysical Journal 967, № 1 (2024): 73. http://dx.doi.org/10.3847/1538-4357/ad3913.

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Abstract We analyze rest-frame ultraviolet to optical spectra of three z ≃ 7.47–7.75 galaxies whose Lyα emission lines were previously detected with Keck/MOSFIRE observations, using the JWST/NIRSpec observations from the Cosmic Evolution Early Release Science survey. From NIRSpec data, we confirm the systemic redshifts of these Lyα emitters, and emission-line ratio diagnostics indicate these galaxies were highly ionized and metal-poor. We investigate Lyα line properties, including the line flux, velocity offset, and spatial extent. For the one galaxy where we have both NIRSpec and MOSFIRE meas

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12

Sönksen, Carsten P., Peter Roepstorff, Per-Olof Markgren, U. Helena Danielson, Markku D. Hämäläinen, and Östen Jansson. "Capture and Analysis of Low Molecular Weight Ligands by Surface Plasmon Resonance Combined with Mass Spectrometry." European Journal of Mass Spectrometry 7, no. 4-5 (2001): 385–91. http://dx.doi.org/10.1255/ejms.448.

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The combination of biomolecular interaction analysis (BIA)by surface plasmon resonance (SPR)and nano-electrospray ionization ion trap mass spectrometry (nanoESI-Ion Trap MS)as well as matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF MS)is demonstrated for the binding of low molecular weight inhibitors (∼ 600 Da) to HIV-1 protease. Inhibitors were captured on sensor chips of a manual or an automated SPR biosensor, to which HIV-1 protease was immobilized. Compounds and buffer components that bound unspecifically to the sensor surface were removed and the in

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13

Tulasi Ram, S., P. V. S. Rama Rao, D. S. V. V. D. Prasad, et al. "The combined effects of electrojet strength and the geomagnetic activity (<I>K<sub>p</sub></I>-index) on the post sunset height rise of the F-layer and its role in the generation of ESF during high and low solar activity periods." Annales Geophysicae 25, no. 9 (2007): 2007–17. http://dx.doi.org/10.5194/angeo-25-2007-2007.

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Abstract. Several investigations have been carried out to identify the factors that are responsible for the day-to-day variability in the occurrence of equatorial spread-F (ESF). But the precise forecasting of ESF on a day-to-day basis is still far from reality. The nonlinear development and the sustenance of ESF/plasma bubbles is decided by the background ionospheric conditions, such as the base height of the F-layer (h'F), the electron density gradient (dN/dz), maximum ionization density (Nmax), geomagnetic activity and the neutral dynamics. There is increasing evidence in the literature dur

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14

Qu, Zhijie, Zeyang Pan, Joel N. Bregman, and Jifeng Liu. "The XMM-Newton Line Emission Analysis Program (X-LEAP). II. The Multiscale Temperature Structures in the Milky Way Hot Gas." Astrophysical Journal 965, no. 2 (2024): 100. http://dx.doi.org/10.3847/1538-4357/ad31a0.

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Abstract This paper presents the multiscale temperature structures in the Milky Way (MW) hot gas, as part of the XMM-Newton Line Emission Analysis Program, surveying the O vii, O viii, and Fe-L band emission features in the XMM-Newton archive. In particular, we define two temperature tracers, I OVIII/I OVII (O87) and I FeL/(I OVII + I OVIII) (FeO). These two ratios cannot be explained simultaneously using single-temperature collisional ionization models, which indicates the need for multitemperature structures in hot gas. In addition, we show three large-scale features in the hot gas: the eROS

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15

Liu, J. Y., P. K. Rajesh, I. T. Lee, and T. C. Chow. "Airglow observations over the equatorial ionization anomaly zone in Taiwan." Annales Geophysicae 29, no. 5 (2011): 749–57. http://dx.doi.org/10.5194/angeo-29-749-2011.

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Abstract. Airglow imaging at mid-latitude stations often show intensity modulations associated with medium scale travelling ionospheric disturbances (MSTID), while those carried out near the equatorial regions reveal depletions caused by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe plasma depletions in the 630.0 nm emission over the equatorial ionization anomaly (EIA) region, Taiwan (23° N, 121° E; 13.5° N Magnetic) during 1998–2002 and 2006–2007. The results show EPB and MSTID depletions in different solar activity conditions. Several new features of the EPB deplet

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16

Kil, H., M. DeMajistre, L. J. Paxton, and Y. Zhang. "<i>F</i>-region Pedersen conductivity deduced using the TIMED/GUVI limb retrievals." Annales Geophysicae 24, no. 5 (2006): 1311–16. http://dx.doi.org/10.5194/angeo-24-1311-2006.

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Abstract. As a proxy of the Rayleigh-Taylor instability growth rate for equatorial plasma bubbles, we investigate the flux-tube integrated F-region Pedersen conductivity (ΣPF) using the electron density profiles (EDPs) provided by the Global Ultraviolet Imager (GUVI) on board the Thermosphere Ionosphere and Mesosphere Energetics and Dynamics (TIMED) satellite. The investigation is conducted using the EDPs obtained in the Atlantic sector at 19:00-22:00 LT during 4–17 August and 6-16 December 2002. The seasonal difference of the strength and location of the equatorial ionization anomalies (EIAs)

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17

Xu, Jin-Long, Ye Xu, Chuan-Peng Zhang, et al. "Gas kinematics and star formation in the filamentary molecular cloud G47.06+0.26." Astronomy & Astrophysics 609 (January 2018): A43. http://dx.doi.org/10.1051/0004-6361/201629189.

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Aims. We performed a multi-wavelength study toward the filamentary cloud G47.06+0.26 to investigate the gas kinematics and star formation. Methods. We present the 12CO (J = 1−0), 13CO (J = 1−0) and C18O (J = 1−0) observations of G47.06+0.26 obtained with the Purple Mountain Observation (PMO) 13.7 m radio telescope to investigate the detailed kinematics of the filament. Radio continuum and infrared archival data were obtained from the NRAO VLA Sky Survey (NVSS), the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL), the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE)

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18

Venkatesan, Aparna, and Andrew Benson. "X-rays and hard ultraviolet radiation from the first galaxies: ionization bubbles and 21-cm observations." Monthly Notices of the Royal Astronomical Society 417, no. 3 (2011): 2264–75. http://dx.doi.org/10.1111/j.1365-2966.2011.19407.x.

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19

Li, Guozhu, Baiqi Ning, Libo Liu, et al. "Correlative study of plasma bubbles, evening equatorial ionization anomaly, and equatorial prereversalE×Bdrifts at solar maximum." Radio Science 43, no. 4 (2008): n/a. http://dx.doi.org/10.1029/2007rs003760.

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Wiens, R. H., B. M. Ledvina, P. M. Kintner, M. Afewerki, and Z. Mulugheta. "Equatorial plasma bubbles in the ionosphere over Eritrea: occurrence and drift speed." Annales Geophysicae 24, no. 5 (2006): 1443–53. http://dx.doi.org/10.5194/angeo-24-1443-2006.

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Abstract. An all-sky imager was installed in Asmara, Eritrea (15.4° N, 38.9° E, 7° N dip) and used to monitor the OI 630-nm nightglow. Nine months of data were studied between September 2001 and May 2002, a time including the recent maximum in the solar activity cycle. Equatorial plasma bubbles (EPBs) were recorded on 63% of nights with adequate viewing conditions. The station location within view of the equatorial ionization anomaly and with a magnetic declination near zero makes it an excellent test case for comparison with satellite studies of the seasonal variation of EPBs with longitude.

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21

Ma, Guanyi, Jinghua Li, Jiangtao Fan, et al. "Observation of Post-Sunset Equatorial Plasma Bubbles with BDS Geostationary Satellites over South China." Remote Sensing 16, no. 18 (2024): 3521. http://dx.doi.org/10.3390/rs16183521.

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An equatorial plasma bubble (EPB) is characterized by ionospheric irregularities which disturb radio waves by causing phase and amplitude scintillations or even signal loss. It is becoming increasingly important in space weather to assure the reliability of radio systems in both space and on the ground. This paper presents a newly established GNSS ionospheric observation network (GION) around the north equatorial ionization anomaly (EIA) crest in south China, which has a longitudinal coverage of ∼30° from 94°E to 124°E. The measurement with signals from geostationary earth orbit (GEO) satellit

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Decataldo, D., A. Lupi, A. Ferrara, A. Pallottini, and M. Fumagalli. "Shaping the structure of a GMC with radiation and winds." Monthly Notices of the Royal Astronomical Society 497, no. 4 (2020): 4718–32. http://dx.doi.org/10.1093/mnras/staa2326.

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ABSTRACT We study the effect of stellar feedback (photodissociation/ionization, radiation pressure, and winds) on the evolution of a Giant Molecular Cloud (GMC), by means of a 3D radiative transfer, hydrosimulation implementing a complex chemical network featuring H2 formation and destruction. We track the formation of individual stars with mass $M\gt 1\, {\rm M}_{\odot }$ with a stochastic recipe. Each star emits radiation according to its spectrum, sampled with 10 photon bins from near-infrared to extreme ultraviolet bands; winds are implemented by energy injection in the neighbouring cells.

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23

Mookerjea, Bhaswati. "Star Formation Triggered by the Expanding Bubble S111." Astrophysical Journal 926, no. 1 (2022): 4. http://dx.doi.org/10.3847/1538-4357/ac4258.

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Abstract This paper investigates the impact of radiative and mechanical feedback from O-type stars on their parent molecular clouds and the triggering of formation of a future generation of stars. We study the infrared bubble S111 created by the embedded massive stellar cluster G316.80–0.05. A significant fraction of gas in shells created due to the compression of the ambient medium by expanding bubbles is photodissociated by the stellar radiation. The kinematics of the shells are thus best studied using spectroscopic observations of singly ionized carbon, the most dominant species. We have us

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24

Jiang, N., and J. Silcox. "Electron Irradiation Damage in Multi-Component Glasses." Microscopy and Microanalysis 6, S2 (2000): 390–91. http://dx.doi.org/10.1017/s1431927600034449.

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Understanding electron beam induced damage in glasses, especially in multi-component glasses, is very important, since the interaction of electron probes with glass is a very common approach to determine glass composition and structure. For example, the decay of characteristic X-ray and Auger electron intensities, using electron beams as probes, of alkalis in glasses have been known for years. In addition, both phase separation and formation of gas bubbles in the glasses have also been reported. Many irradiation effects are strongly dependent on the structure, bonding and composition of matter

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Eyal, Y., R. Evron, and Y. Cohen. "Defect Structure of Ion-Irradiated Amorphous SiO2." Journal of Applied Crystallography 30, no. 5 (1997): 618–22. http://dx.doi.org/10.1107/s0021889897001325.

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Uniformly enhanced small-angle X-ray scattering intensities of amorphous SiO2, measured following irradiation with 320 keV H+ and He+ beams, are shown to be correlated, irrespective of the incident ion, with the O and Si cumulative displacement yields. Damage by both beams originated primarily from nuclear stopping but, under H+-ion irradiation, contributions from ionization processes were significant as well. At low beam fluences, the irradiated structure is compatible with the presence of stable radiation-induced interstitial-like O and Si atoms and complementary O and Si vacancy-like sites.

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Park, Jaeheung, Stephen B. Mende, Richard W. Eastes, and Harald U. Frey. "Climatology of Equatorial Plasma Bubbles in Ionospheric Connection Explorer/Far-UltraViolet (ICON/FUV) Limb Images." Journal of Astronomy and Space Sciences 39, no. 3 (2022): 87–98. http://dx.doi.org/10.5140/jass.2022.39.3.87.

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The Far-UltraViolet (FUV) imager onboard the Ionospheric Connection Explorer (ICON) spacecraft provides two-dimensional limb images of oxygen airglow in the nightside low-latitude ionosphere that are used to determine the oxygen ion density. As yet, no FUV limb imager has been used for climatological analyses of Equatorial Plasma Bubbles (EPBs). To examine the potential of ICON/FUV for this purpose, we statistically investigate small-scale (~180 km) fluctuations of oxygen ion density in its limb images. The seasonal-longitudinal variations of the fluctuation level reasonably conform to the EPB

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Lee, C. C., F. D. Chu, W. S. Chen, et al. "Spread F, GPS phase fluctuations, and plasma bubbles near the crest of equatorial ionization anomaly during solar maximum." Journal of Geophysical Research: Space Physics 114, A8 (2009): n/a. http://dx.doi.org/10.1029/2009ja014195.

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Dahmer-Hahn, L. G., R. Riffel, T. V. Ricci, et al. "A panchromatic spatially resolved study of the inner 500 pc of NGC 1052 – II. Gas excitation and kinematics." Monthly Notices of the Royal Astronomical Society 489, no. 4 (2019): 5653–68. http://dx.doi.org/10.1093/mnras/stz2453.

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ABSTRACT We map the optical and near-infrared (NIR) emission-line flux distributions and kinematics of the inner 320 × 535 pc2 of the elliptical galaxy NGC 1052. The integral field spectra were obtained with the Gemini Telescope using the GMOS-IFU and NIFS instruments, with angular resolutions of 0.88 and 0.1 arcsec in the optical and NIR, respectively. We detect five kinematic components: (1) and (2) two spatially unresolved components: a broad-line region visible in H α, with a full width at half-maximum (FWHM) of ∼3200 km s−1, and an intermediate broad component seen in the [O iii] λλ4959,5

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Pakull, Manfred W. "High-exitation nebulae around Magellanic Wolf-Rayet stars." Proceedings of the International Astronomical Union 4, S256 (2008): 437–42. http://dx.doi.org/10.1017/s1743921308028834.

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AbstractThe SMC harbours a class of hot nitrogen-sequence Wolf-Rayet stars (WNE) that display only relatively weak broad Heiiλ4686 emission indicative of their low mass-loss rates and which are therefore hard to detect. However, such stars are possible emitters of strong He+Lyman continua which in turn could ionize observable Heiiiregions, i.e. highly excited Hiiregions emitting nebular Heiiλ4686 emission. We here report the discovery of a second Heiiiregion in the SMC within OB association NGC 249 within which the weak-lined WN star SMC WR10 is embedded. SMC WR10 is of special importance sinc

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Roberts-Borsani, Guido, Tommaso Treu, Charlotte Mason та ін. "Nature and Nurture? Comparing Lyα Detections in UV-bright and Fainter [O iii]+Hβ Emitters at z ∼ 8 with Keck/MOSFIRE". Astrophysical Journal 948, № 1 (2023): 54. http://dx.doi.org/10.3847/1538-4357/acc798.

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Abstract The 100% detection rate of Lyα emission in a sample of four luminous z ∼ 8 galaxies with red Spitzer/IRAC colors suggests objects with unusual ionizing capabilities that created early ionized bubbles in a neutral era. Whether such bubbles reflect enhanced ionizing properties (nature) or an overdense environment (nurture), however, remains unclear. Here we aim to distinguish between these hypotheses via a search for Lyα emission in five fainter galaxies drawn from the CANDELS-GOODS fields using a similar IRAC excess and UV magnitudes that should reflect reduced clustering effects. Usin

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Tremblin, P., E. Audit, V. Minier, W. Schmidt, and N. Schneider. "Formation of structures around HII regions: ionization feedback from massive stars." Proceedings of the International Astronomical Union 10, H16 (2012): 590. http://dx.doi.org/10.1017/s1743921314012307.

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AbstractWe present a new model for the formation of dense clumps and pillars around HII regions based on shocks curvature at the interface between a HII region and a molecular cloud. UV radiation leads to the formation of an ionization front and of a shock ahead. The gas is compressed between them forming a dense shell at the interface. This shell may be curved due to initial interface or density modulation caused by the turbulence of the molecular cloud. Low curvature leads to instabilities in the shell that form dense clumps while sufficiently curved shells collapse on itself to form pillars

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Wang, Weicong, Yunxia Zhou, Bowen Liu, et al. "Tannin-Epoxidized Soybean Oil as Bio-Based Resin for Fabrication of Grinding Wheel." Polymers 14, no. 24 (2022): 5423. http://dx.doi.org/10.3390/polym14245423.

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Formaldehyde-free epoxidized soybean oil-based resin has been prepared under acidic conditions by co-condensation of the epoxidized soybean oil and condensed tannin originating from agricultural and forestry sources as the main raw materials, whereas 1,6-hexanediamine was employed as a cross-linking agent. Fourier transform infrared spectroscopy (FTIR) and electrospray ionization (ESI) corroborated that tannin and epoxidized soybean oil underwent crosslinking under acidic conditions supported by hexamethylenediamine. A bio-based grinding wheel was fabricated by formulation of the developed res

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Mukherjee, G. K. "Mapping of the Simultaneous Movement of the Equatorial Ionization Anomaly (EIA) and Ionospheric Plasma Bubbles Through All-sky Imaging of OI630nm Emission." Terrestrial, Atmospheric and Oceanic Sciences 13, no. 1 (2002): 053. http://dx.doi.org/10.3319/tao.2002.13.1.53(a).

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Yusef-Zadeh, F., and M. Wardle. "Cosmic-ray-driven outflow from the Galactic Centre and the origin of magnetized radio filaments." Monthly Notices of the Royal Astronomical Society: Letters 490, no. 1 (2019): L1—L5. http://dx.doi.org/10.1093/mnrasl/slz134.

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Abstract Radio, X-ray, and infrared observations of the inner few hundred parsecs of the Galactic Centre have highlighted two characteristics of the interstellar medium. The cosmic-ray ionization rate derived from molecular ions such as H$^+_3$ is at least two to three orders of magnitude higher than in the Galactic disc. The other is bipolar X-ray and radio emission away from the Galactic plane. These features are consistent with a scenario in which high cosmic-ray pressure drives large-scale winds away from the Galactic plane. The interaction of such a wind with stellar wind bubbles may expl

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Li, Qiang, Yanbo Zhu, Kun Fang, and Jisi Fang. "Statistical Study of the Seasonal Variations in TEC Depletion and the ROTI during 2013–2019 over Hong Kong." Sensors 20, no. 21 (2020): 6200. http://dx.doi.org/10.3390/s20216200.

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Equatorial plasma bubbles (EPBs) can cause large total electron content (TEC) gradient magnitudes and significant density irregularities. In this paper, depletions and irregularities due to EPBs are identified by using the Global Positioning System (GPS)-TEC time series extracted from nine Global Navigation Satellite System (GNSS) stations over Hong Kong near the equatorial ionization anomaly (EIA) crest region from 2013 to 2019. The correlation analyses between the daily variation in the rate of TEC change index (ROTI) and that of the EPB occurrence rate, depth, and duration are presented. Th

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Wu, Kun, and Liying Qian. "Interactions between MSTIDs and Ionospheric Irregularities in the Equatorial Region Observed on 13–14 May 2013." Remote Sensing 16, no. 13 (2024): 2413. http://dx.doi.org/10.3390/rs16132413.

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We investigate the interactions between medium-scale traveling ionospheric disturbances (MSTIDs) and the equatorial ionization anomaly (EIA) as well as between MSTIDs and equatorial plasma bubbles (EPBs) on the night of 13–14 May 2013, based on observations from multiple instruments (an all-sky imager, digisonde, and global positioning system (GPS)). Two dark bands (the low plasma density region) for the MSTIDs were observed moving toward each other, encountering and interacting with the EIA, and subsequently interacting again with the EIA before eventually dissipating. Then, a new dark band o

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Bik, A., G. Östlin, V. Menacho, et al. "The super star cluster driven feedback in ESO338-IG04 and Haro 11." Proceedings of the International Astronomical Union 12, S316 (2015): 44–49. http://dx.doi.org/10.1017/s1743921316007031.

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AbstractThe stellar content of young massive star clusters emit large amounts of Lyman continuum photons and inject momentum into the inter stellar medium (ISM) by the strong stellar winds of the most massive stars in the cluster. When the most massive stars explode as supernovae, large amounts of mechanical energy are injected in the ISM. A detailed study of the ISM around these massive cluster provides insights on the effect of cluster feedback.We present high quality integral field spectroscopy taken with VLT/MUSE of two starburst galaxies: ESO 338-IG04 and Haro 11. Both galaxies contain a

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YUAN, LI, and PING HE. "INFLUENCE OF SONOCHEMISTRY ON SINGLE-BUBBLE SONOLUMINESCENCE." Modern Physics Letters B 19, no. 28n29 (2005): 1711–14. http://dx.doi.org/10.1142/s0217984905010281.

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Spherical oscillation of an acoustically levitated gas bubble in water was simulated numerically to elucidate the phenomenon of single-bubble sonoluminescence (SBSL). A refined hydro-chemical model was used, which took into account the processes of water vapor evaporation and condensation, mass diffusion, and chemical reactions. The numerical results show significant water vapor dissociations but rather low degrees of ionizations. A widely accepted weakly ionized gas model is then used to compute the light emission. Contrary to earlier predictions without chemical reactions, the present calcul

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Fujimoto, Seiji, Bingjie Wang, John R. Weaver, et al. "UNCOVER: A NIRSpec Census of Lensed Galaxies at z = 8.50–13.08 Probing a High-AGN Fraction and Ionized Bubbles in the Shadow." Astrophysical Journal 977, no. 2 (2024): 250. https://doi.org/10.3847/1538-4357/ad9027.

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Abstract We present JWST NIRSpec prism spectroscopy of lensed galaxies at z ≳ 9 found behind the massive galaxy cluster Abell 2744 in the UNCOVER Cycle 1 Treasury Program. We confirm the redshift via emission lines and/or the Lyα break for 10 galaxies at z = 8.50–13.08 down to M V = −17.3. We achieve a 100% confirmation rate for z > 9 candidates reported in H. Atek et al. Using six sources with multiple line detections, we find that offsets in redshift estimates between the lines and the Lyα break alone can be ±0.2, raising caution in designing future follow-up spectroscopy for the break-on

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Thampi, S. V., T. K. Pant, S. Ravindran, C. V. Devasia, and R. Sridharan. "Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX." Annales Geophysicae 22, no. 10 (2004): 3445–60. http://dx.doi.org/10.5194/angeo-22-3445-2004.

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Abstract. Equatorial ionosphere poses a challenge to any algorithm that is used for tomographic reconstruction because of the phenomena like the Equatorial Ionization Anomaly (EIA) and Equatorial Spread F (ESF). Any tomographic reconstruction of ionospheric density distributions in the equatorial region is not acceptable if it does not image these phenomena, which exhibit large spatial and temporal variability, to a reasonable accuracy. The accuracy of the reconstructed image generally depends on many factors, such as the satellite-receiver configuration, the ray path modelling, grid intersect

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Tahir, Afnan, Falin Wu, Munawar Shah, et al. "Multi-Instrument Observation of the Ionospheric Irregularities and Disturbances during the 23–24 March 2023 Geomagnetic Storm." Remote Sensing 16, no. 9 (2024): 1594. http://dx.doi.org/10.3390/rs16091594.

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This work investigates the ionospheric response to the March 2023 geomagnetic storm over American and Asian sectors from total electron content (TEC), rate of TEC index, ionospheric heights, Swarm plasma density, radio occultation profiles of Formosat-7/Cosmic-2 (F7/C2), Fabry-Perot interferometer driven neutral winds, and E region electric field. During the storm’s main phase, post-sunset equatorial plasma bubbles (EPBs) extend to higher latitudes in the western American longitudes, showing significant longitudinal differences in the American sector. Over the Indian longitudes, suppression of

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Paul, Krishnendu Sekhar, Haris Haralambous, Mefe Moses, and Sharad C. Tripathi. "Effects of the October 2024 Storm over the Global Ionosphere." Remote Sensing 17, no. 13 (2025): 2329. https://doi.org/10.3390/rs17132329.

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The present study analyzes the global ionospheric response to the intense geomagnetic storm of 10–11 October 2024 (SYM—H minimum of −346 nT), using observations from COSMIC—2 and Swarm satellites, GNSS TEC, and Digisondes. Significant uplift of the F-region was observed across both Hemispheres on the dayside, primarily driven by equatorward thermospheric winds and prompt penetration electric fields (PPEFs). However, this uplift did not correspond with increases in foF2 due to enhanced molecular nitrogen-promoting recombination in sunlit regions and the F2 peak rising beyond the COSMIC—2 detect

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Moini, Mehdi, Ping Cao, and Allen J. Bard. "Hydroquinone as a Buffer Additive for Suppression of Bubbles Formed by Electrochemical Oxidation of the CE Buffer at the Outlet Electrode in Capillary Electrophoresis/Electrospray Ionization-Mass Spectrometry." Analytical Chemistry 71, no. 8 (1999): 1658–61. http://dx.doi.org/10.1021/ac9811266.

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Vankadara, Ram Kumar, Punyawi Jamjareegulgarn, Gopi Krishna Seemala, Md Irfanul Haque Siddiqui, and Sampad Kumar Panda. "Trailing Equatorial Plasma Bubble Occurrences at a Low-Latitude Location through Multi-GNSS Slant TEC Depletions during the Strong Geomagnetic Storms in the Ascending Phase of the 25th Solar Cycle." Remote Sensing 15, no. 20 (2023): 4944. http://dx.doi.org/10.3390/rs15204944.

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The equatorial plasma bubbles (EPBs) are depleted plasma density regions in the ionosphere occurring during the post-sunset hours, associated with the signal fading and scintillation signatures in the trans-ionospheric radio signals. Severe scintillations may critically affect the performance of dynamic systems relying on global navigation satellite system (GNSS)-based services. Furthermore, the occurrence of scintillations in the equatorial and low latitudes can be triggered or inhibited during space weather events. In the present study, the possible presence of the EPBs during the geomagneti

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Мареев, Е. И., Н. М. Ашарчук, В. В. Ровенко та В. И. Юсупов. "Динамика перехода воды в сверхкритическое состояние при сверхбыстром нагреве ультракороткими лазерными импульсами". Сверхкритические Флюиды: Теория и Практика, № 4(19) (31 грудня 2024): 44–61. https://doi.org/10.34984/scftp.2024.19.4.003.

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Экспериментально и с помощью численного моделирования, основанного на классическом методе молекулярной динамики в сочетании с двухтемпературной моделью и динамическими скоростными уравнениями, восстановлена динамика фемтосекундного лазерного воздействия на воду. Данный процесс происходит в несколько этапов: изначально фемтосекундный лазерный импульс взаимодействует с электронной подсистемой, генерируя плазму за счет многофотонной, туннельной и ударной ионизации. Передача энергии от электронов плазмы к атомам, как показывает двухтемпературная модель, приводит к сверхбыстрому нагреву вещества до

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Böhringer, Hans. "Equilibrium Ionization and Non-Equilibrium Ionization Plasma Models." International Astronomical Union Colloquium 166 (1997): 341–52. http://dx.doi.org/10.1017/s0252921100071232.

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AbstractThis paper provides a brief review on ionization and radiation models of an optically thin, hot plasma and their application to the interpretation of observations of the Local Bubble. The basic structure and atomic physics ingredients of the models are outlined. Some general characteristic results of ionization equilibrium and non-equilibrium calculations are shown. Recent progress in plasma model codes is reviewed. The interpretation of the observations of absorption lines and emission spectra from the Local Bubble is discussed in the framework of ionization equilibrium and non-equili

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Vankadara, Ram Kumar, Sampad Kumar Panda, Christine Amory-Mazaudier, et al. "Signatures of Equatorial Plasma Bubbles and Ionospheric Scintillations from Magnetometer and GNSS Observations in the Indian Longitudes during the Space Weather Events of Early September 2017." Remote Sensing 14, no. 3 (2022): 652. http://dx.doi.org/10.3390/rs14030652.

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Scintillation due to ionospheric plasma irregularities remains a challenging task for the space science community as it can severely threaten the dynamic systems relying on space-based navigation services. In the present paper, we probe the ionospheric current and plasma irregularity characteristics from a latitudinal arrangement of magnetometers and Global Navigation Satellite System (GNSS) stations from the equator to the far low latitude location over the Indian longitudes, during the severe space weather events of 6–10 September 2017 that are associated with the strongest and consecutive s

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Jennings, W. D., C. A. Watkinson, and F. B. Abdalla. "Analysing the Epoch of Reionization with three-point correlation functions and machine learning techniques." Monthly Notices of the Royal Astronomical Society 498, no. 3 (2020): 4518–32. http://dx.doi.org/10.1093/mnras/staa2598.

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ABSTRACT Three-point and high-order clustering statistics of the high-redshift 21 cm signal contain valuable information about the Epoch of Reionization (EoR). We present 3PCF-fast, an optimized code for estimating the three-point correlation function (3PCF) of 3D pixelized data such as the outputs from numerical and seminumerical simulations. After testing 3PCF-fast on data with known analytical 3PCF, we use machine learning techniques to recover the mean bubble size and global ionization fraction from correlations in the outputs of the publicly available 21cmfast code. We assume that foregro

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Murmu, Chandra Shekhar, Kanan K. Datta, Suman Majumdar, and Thomas R. Greve. "Impact of astrophysical scatter on the epoch of reionization [H i]₂₁ bispectrum." Journal of Cosmology and Astroparticle Physics 2024, no. 08 (2024): 032. http://dx.doi.org/10.1088/1475-7516/2024/08/032.

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Abstract It is believed that the first star-forming galaxies are the main drivers of cosmic reionization. It is usually assumed that there is a one-to-one relationship between the star formation rate (SFR) inside a galaxy and the host halo mass in semi-analytical/numerical modeling of large-scale ionization maps during the epoch of reionization. However, more accurate simulations and observations suggest that the SFR and ionizing luminosity in galaxies may vary considerably even if the host halo mass is the same. This astrophysical scatter can introduce an additional non-Gaussianity in the [H

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Franklin, Cole. "Impacts of Ionization Potentials and Megasonic Dispersion." Solid State Phenomena 145-146 (January 2009): 19–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.145-146.19.

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It has been shown that megasonics can accelerate strip processes such as doped and plasma treated photoresist [1]. However, applied megasonic energy can also damage sensitive semiconductor devices. It was shown that adding a solvent such as IPA or lowering the temperature helps to control cavitation in semi-aqueous fluids [2]. Sonochemical reactions have been observed in various industries, however, there are no published observations in semiconductor cleaning. Ions may form in megasonic driven bubble collapse impacted by the characteristics of a gas or liquid that enters the bubble from the b

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