Готові списки джерел за темами / Arecibo Ionospheric Observatory

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Добірка наукової літератури з теми "Arecibo Ionospheric Observatory"

Автор: Grafiati
Опубліковано: 26 липня 2024
Оновлено: 27 липня 2024

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Статті в журналах з теми "Arecibo Ionospheric Observatory"

1

Mathews, J. D. "A short history of geophysical radar at Arecibo Observatory." History of Geo- and Space Sciences 4, no. 1 (March 13, 2013): 19–33. http://dx.doi.org/10.5194/hgss-4-19-2013.

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Abstract. As Arecibo Observatory (AO) approaches its 50th anniversary, it is appropriate to review the many radars and ionospheric heaters that have been deployed on or near the 305 m dish and to summarize some of the innovative radar-based geophysical research that has resulted. The reasons William E. (Bill) Gordon developed the 305 m Arecibo dish are well known but are briefly reviewed. The early and then more recent radar/feed designs are reviewed as geophysical uses of Arecibo have evolved and as the full potential of the dish and nearby facilities was and is being realized from HF through S-band frequencies. This history surely has some gaps and there are a few mysteries. The community is encouraged to fill these gaps and to help complete the history.
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2

Werthimer, Dan, Stuart Bowyer, David Ng, Charles Donnelly, Jeff Cobb, Michael Lampton, and Sabine Airieau. "The Berkeley Seti Program: Serendip IV Instrumentation." International Astronomical Union Colloquium 161 (January 1997): 683–88. http://dx.doi.org/10.1017/s0252921100015244.

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AbstractThe SERENDIP program is an ongoing search for narrow band radio signals from extraterrestrial civilizations. Each generation SERENDIP instrument has on average been about 35 times more powerful than its predecessor. In this paper we discuss the hardware design of the latest generation instrument, SERENDIP IV, which will be deployed in early 1997 for a 21 cm sky survey at the National Astronomy and Ionospheric Center’s 305 meter radio telescope in Arecibo, Puerto Rico. SERENDIP IV is a 167 million channel spectrum analyzer, covering a 100 Mhz bandwidth, with 0.6 Hz resolution and a 1.7 second integration time. SERENDIP IV’s modular design incorporates a bank of digital mixers and filters to separate the 100 MHz band into forty 2.5 MHz sub-bands. Each 2.5 MHz sub-band is further broken down into 0.6 Hz bins by means of a four million point fast Fourier transform. The resulting power spectra are analyzed by 40 high speed processors. Narrow band signals having power significantly above background noise levels are recorded along with telescope coordinates, time, and frequency. The data are sent in real time to Berkeley for analysis. SERENDIP IV hardware is also utilized by the Ohio State University SETI program and pulsar programs at Nancay Observatory (France), the US Naval Research Lab, the Effelsberg telescope (Germany), NRAO’s Greenbank Observatory and NAIC’s Arecibo Observatory.
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3

Bakhmetieva, Nataliya V., and Gennadiy I. Grigoriev. "Study of the Mesosphere and Lower Thermosphere by the Method of Creating Artificial Periodic Irregularities of the Ionospheric Plasma." Atmosphere 13, no. 9 (August 24, 2022): 1346. http://dx.doi.org/10.3390/atmos13091346.

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This article presented a brief review of studies of the Earth’s ionosphere at the heights of the mesosphere and lower thermosphere by a method based on the creation of artificial periodic inhomogeneities (APIs) of the ionospheric plasma by high-frequency radiation from powerful thermal installations. APIs are created by a standing wave due to the interference between upward-propagating radio waves and those reflected from the ionosphere. API studies of the ionosphere were based on Bragg scattering of probing impulse signals from an artificial periodic structure. The method makes it possible to measure the parameters of the neutral and ionized components of the Earth’s atmosphere. Note that, despite the fact that the API method assumes an artificial perturbation of the ionospheric plasma, the parameters of the mesosphere and lower thermosphere are determined at the stage of inhomogeneity relaxation and characterize the undisturbed medium. To date, periodic inhomogeneities have been observed at the heating points of Zimenki and Sura ionospheric heating facility (SURA, Vasilsursk, Russia), Gissar (Tajikistan), Arecibo (Puerto Rico, USA), High Power Auroral Stimulation Observatory (HIPAS) and High Frequency Active Auroral Research Program (HAARP, Gakona, AK, USA), and European Incoherent Scatter (EISCAT, Tromso, Norway). Most of the API studies of the ionosphere were carried out at the SURA mid-latitude heating facility (56.1° N; 46.1° E). The review presented the main results of determining the parameters of the ionosphere and neutral atmosphere at altitudes of 60–120 km and studies of the atmosphere during sunrise and sunset events and solar eclipses. In fact, the review is far from a complete illustration of the possibilities of using the API method to study the mesosphere and lower thermosphere.
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4

Mendillo, Michael, Jeffrey Baumgardner, Daniel Nottingham, Jules Aarons, Bodo Reinisch, James Scali, and Michael Kelley. "Investigations of thermospheric-ionospheric dynamics with 6300-Å images from the Arecibo Observatory." Journal of Geophysical Research: Space Physics 102, A4 (April 1, 1997): 7331–43. http://dx.doi.org/10.1029/96ja02786.

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5

Eccles, Vince, Hien Vo, Jonathan Thompson, Sixto Gonzalez, and Jan J. Sojka. "Database of electron density profiles from Arecibo Radar Observatory for the assessment of ionospheric models." Space Weather 9, no. 1 (January 2011): n/a. http://dx.doi.org/10.1029/2010sw000591.

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6

Hysell, David L., Miguel Larsen, and Michael Sulzer. "Observational evidence for new instabilities in the midlatitude <i>E</i> and <i>F</i> region." Annales Geophysicae 34, no. 11 (November 3, 2016): 927–41. http://dx.doi.org/10.5194/angeo-34-927-2016.

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Abstract. Radar observations of the E- and F-region ionosphere from the Arecibo Observatory made during moderately disturbed conditions are presented. The observations indicate the presence of patchy sporadic E (Es) layers, medium-scale traveling ionospheric disturbances (MSTIDs), and depletion plumes associated with spread F conditions. New analysis techniques are applied to the dataset to infer the vector plasma drifts in the F region as well as vector neutral wind and temperature profiles in the E region. Instability mechanisms in both regions are evaluated. The mesosphere–lower-thermosphere (MLT) region is found to meet the conditions for neutral dynamic instability in the vicinity of the patchy Es layers even though the wind shear was relatively modest. An inversion in the MLT temperature profile contributed significantly to instability in the vicinity of one patchy layer. Of particular interest is the evidence for the conditions required for neutral convective instability in the lower-thermosphere region (which is usually associated with highly stable conditions) due to the rapid increase in temperature with altitude. A localized F-region plasma density enhancement associated with a sudden ascent up the magnetic field is shown to create the conditions necessary for convective plasma instability leading to the depletion plume and spread F. The growth time for the instability is short compared to the one described by [Perkins(1973)]. This instability does not offer a simple analytic solution but is clearly present in numerical simulations. The instability mode has not been described previously but appears to be more viable than the various mechanisms that have been suggested previously as an explanation for the occurrence of midlatitude spread F.
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7

Djuth, F. T., M. P. Sulzer, J. H. Elder, and V. B. Wickwar. "High-resolution studies of atmosphere-ionosphere coupling at Arecibo Observatory, Puerto Rico." Radio Science 32, no. 6 (November 1997): 2321–44. http://dx.doi.org/10.1029/97rs02797.

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8

Isham, Brett, Terence Bullett, Björn Gustavsson, Emil Polisensky, Christiano Brum, Christopher Fallen, Vasyl Belyey, et al. "Science goals for a high-frequency radar and radio imaging array." Frontiers in Astronomy and Space Sciences 10 (August 1, 2023). http://dx.doi.org/10.3389/fspas.2023.1064368.

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A medium and high-frequency antenna array for radar and radio imaging of the ionosphere is planned for installation in Aguadilla, Puerto Rico. Science goals include the study of space weather, radio propagation, meteors, lightning, and plasma physics. Radio imaging is ideal for the study of stimulated ionospheric radio emissions, such as those induced by the Arecibo Observatory high-power HF radio transmitter, which is likely to be restored to operation in the near future. The array will be complemented by a wide variety of instruments fielded by collaborators, and will be a rich source of student projects at all levels.
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9

da Silva, Caitano L., Sophia D. Salazar, Christiano G. M. Brum, and Pedrina Terra. "Survey of electron density changes in the daytime ionosphere over the Arecibo Observatory due to lightning and solar flares." Scientific Reports 11, no. 1 (May 13, 2021). http://dx.doi.org/10.1038/s41598-021-89662-x.

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AbstractOptical observations of transient luminous events and remote-sensing of the lower ionosphere with low-frequency radio waves have demonstrated that thunderstorms and lightning can have substantial impacts in the nighttime ionospheric D region. However, it remains a challenge to quantify such effects in the daytime lower ionosphere. The wealth of electron density data acquired over the years by the Arecibo Observatory incoherent scatter radar (ISR) with high vertical spatial resolution (300-m in the present study), combined with its tropical location in a region of high lightning activity, indicate a potentially transformative pathway to address this issue. Through a systematic survey, we show that daytime sudden electron density changes registered by Arecibo’s ISR during thunderstorm times are on average different than the ones happening during fair weather conditions (driven by other external factors). These changes typically correspond to electron density depletions in the D and E region. The survey also shows that these disturbances are different than the ones associated with solar flares, which tend to have longer duration and most often correspond to an increase in the local electron density content.
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10

Martínez-Ledesma, Miguel, and Francisco Jaramillo Montoya. "Performance evaluation of the particle swarm optimization algorithm to unambiguously estimate plasma parameters from incoherent scatter radar signals." Earth, Planets and Space 72, no. 1 (November 9, 2020). http://dx.doi.org/10.1186/s40623-020-01297-w.

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Abstract Simultaneously estimating plasma parameters of the ionosphere presents a problem for the incoherent scatter radar (ISR) technique at altitudes between ~ 130 and ~ 300 km. Different mixtures of ion concentrations and temperatures generate almost identical backscattered signals, hindering the discrimination between plasma parameters. This temperature–ion composition ambiguity problem is commonly solved either by using models of ionospheric parameters or by the addition of parameters determined from the plasma line of the radar. Some studies demonstrated that it is also possible to unambiguously estimate ISR signals with very low signal fluctuation using the most frequently used non-linear least squares (NLLS) fitting algorithm. In a previous study, the unambiguous estimation performance of the particle swarm optimization (PSO) algorithm was evaluated, outperforming the standard NLLS algorithm fitting signals with very small fluctuations. Nevertheless, this study considered a confined search range of plasma parameters assuming a priori knowledge of the behavior of the ion composition and signals with very large SNR obtained at the Arecibo Observatory, which are not commonly feasible at other ISR facilities worldwide. In the present study, we conduct Monte Carlo simulations of PSO fittings to evaluate the performance of this algorithm at different signal fluctuation levels. We also determine the effect of adding different combinations of parameters known from the plasma line, different search ranges, and internal configurations of PSO parameters. Results suggest that similar performances are obtained by PSO and NLLS algorithms, but PSO has much larger computational requirements. The PSO algorithm obtains much lower convergences when no a priori information is provided. The a priori knowledge of Ne and $${T}_{e}/{T}_{i}$$ T e / T i parameters shows better convergences and “correct” estimations. Also, results demonstrate that the addition of $${N}_{e}$$ N e and $${T}_{e}$$ T e parameters provides the most information to solve the ambiguity problem using both optimization algorithms.
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Дисертації з теми "Arecibo Ionospheric Observatory"

1

Santana, Julio III. "Investigating Ionospheric Parameters Using the Plasma Line Measurements From Incoherent Scatter Radar." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1344024880.

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Книги з теми "Arecibo Ionospheric Observatory"

1

United States. National Aeronautics and Space Administration., ed. Radar investigations of barium releases over Arecibo Observatory, Puerto Rico. El Segundo, CA: Geospace Research, Inc., 1995.

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2

Snežana, Stanimirović, National Radio Astronomy Observatory (U.S.), and National Astronomy and Ionosphere Center (U.S.), eds. Single-dish radio astronomy: Techniques and applications : proceedings of the NAIC-NRAO summer school held at National Astronomy and Ionosphere Center, Arecibo Observatory, Arecibo, Puerto Rico, USA, 10-15 June 2001. San Francisco, Calif: Astronomical Society of the Pacific, 2002.

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3

Radar investigations of barium releases over Arecibo Observatory, Puerto Rico. El Segundo, CA: Geospace Research, Inc., 1995.

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4

National Radio Astronomy Observatory (Contributor), National Astronomy and Ionosphere Center (Contributor), and Sneezana Stanimirovic (Editor), eds. Single-Dish Radio Astronomy: Techniques and Applications : Proceedings of the Naic-Nrao Summer School Held at National Astronomy and Ionosphere Center, Arecibo Observatory, arecib. Astronomical Society of the Pacific, 2002.

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Тези доповідей конференцій з теми "Arecibo Ionospheric Observatory"

1

Dighe, Kalpak A., Craig A. Tepley, Raul Garcia, and Jonathan Friedman. "The Arecibo Observatory Daytime Lidar : Preliminary Results." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/orsa.1993.tud.15.

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The vertical propagation of atmospheric tides and acoustic gravity waves and their corresponding travelling ionospheric disturbances play a crucial role in the transportation and balance of momentum and energy in the earth's atmosphere. The unique availability of both radar and lidar instrumentation at Arecibo can provide simultaneous access to the neutral density, temperature and wind perturbations induced by such wave activity at mesospheric and stratospheric altitudes.
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2

Rankin, Joanna M., C. Bassa, Z. Wang, A. Cumming, and V. M. Kaspi. "Remembering the Early Days of Pulsars at the Arecibo Ionospheric Observatory." In 40 YEARS OF PULSARS: Millisecond Pulsars, Magnetars and More. AIP, 2008. http://dx.doi.org/10.1063/1.2900137.

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3

Tepley, Craig A. "Observations of Winds of the Stratosphere and Mesosphere at Arecibo, Puerto Rico Using a Doppler Rayleigh Lidar." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/orsa.1993.wa.2.

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At the Arecibo Observatory we use a variety of radar and optical instruments to measure the properties of the Earth's atmosphere and ionosphere. With the incoherent scatter radar we are sensitive to the ionized portion of the upper atmosphere from about half an Earth radius (RE) down to nearly 60 km during daylight, and 100-150 km during the night when the molecular ionization of this lower part recombines. During both day and night, the winds and turbulent layer structures of the troposphere and stratosphere are accessible up to 25 km with the coherent scatter radar systems. We also use a variety of optical spectro-photometric instruments at Arecibo to study airglow emissions originating from various layers within the atmosphere. Because of the nature of the emitters and their corresponding chemistry, optical remote sensing more preferentially samples the condition of the neutral atmosphere. Thus, by combining simultaneous radar and optical techniques, we can investigate a variety of problems, such as the electrodynamics of the thermosphere, which require data on both the neutral and ionized atmosphere. Much of this instrumentation at Arecibo has been in operation and actively collecting data since the mid-1960s.
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4

da Silva, Caitano L., Sophia D. Salazar, Christiano G. M. Brum, and Pedrina Terra. "Lightning Effects in the Ionosphere Over The Arecibo Observatory." In 2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2020. http://dx.doi.org/10.23919/ursigass49373.2020.9232366.

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5

Altschuler, Daniel R. "The National Astronomy and Ionosphere Center’s (NAIC) Arecibo Observatory in Puerto Rico." In First tropical workshop on particle physics and cosmology and the second Latin American symposium on high energy physics. AIP, 1998. http://dx.doi.org/10.1063/1.56603.

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