Relevant bibliographies by topics / Equatorial E-region

Academic literature on the topic 'Equatorial E-region'

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Published: 6 September 2023

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Journal articles on the topic "Equatorial E-region"

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Raghavarao, R., A. K. Patra, and S. Sripathi. "Equatorial E region irregularities: a review of recent observations." Journal of Atmospheric and Solar-Terrestrial Physics 64, no. 12-14 (August 2002): 1435–43. http://dx.doi.org/10.1016/s1364-6826(02)00107-4.

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Kherani, Esfhan A., and Eurico R. de Paula. "Observations of Quasi-Periodic Electric Field Disturbances in the E Region before and during the Equatorial Plasma Bubble." Atmosphere 12, no. 9 (August 27, 2021): 1106. http://dx.doi.org/10.3390/atmos12091106.

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Wave-like electric field disturbances in the ionosphere before the Equatorial Plasma Bubble (EPB) are the subject of numerous recent studies that address the issue of possible short-term forecasting of EPB. We report the observations of the Equatorial Quasi-Periodic-Electric field Disturbances (QP-EDs) of the Field-aligned Irregularities (FAI) in the E region before the EPB occurrence in the F region. They are observed from 30 MHz coherent scatter radar during the SpreadFEx campaign 2005 carried out in Brasil. The presently reported QP-EDs at the equatorial E region below an altitude of 110 km are undescribed so far. Though QP-EDs characteristics vary on a day-to-day basis, consistent features are their intensification before the EPB, and their simultaneous occurrence with EPBs. This study highlights the monitoring of QP-EDs in the short-term forecasting of EPBs and further reveals the robust energetics of vertical coupling between E and F regions.
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Onohara, A. N., I. S. Batista, and H. Takahashi. "The ultra-fast Kelvin waves in the equatorial ionosphere: observations and modeling." Annales Geophysicae 31, no. 2 (February 7, 2013): 209–15. http://dx.doi.org/10.5194/angeo-31-209-2013.

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Abstract. The main purpose of this study is to investigate the vertical coupling between the mesosphere and lower thermosphere (MLT) region and the ionosphere through ultra-fast Kelvin (UFK) waves in the equatorial atmosphere. The effect of UFK waves on the ionospheric parameters was estimated using an ionospheric model which calculates electrostatic potential in the E-region and solves coupled electrodynamics of the equatorial ionosphere in the E- and F-regions. The UFK wave was observed in the South American equatorial region during February–March 2005. The MLT wind data obtained by meteor radar at São João do Cariri (7.5° S, 37.5° W) and ionospheric F-layer bottom height (h'F) observed by ionosonde at Fortaleza (3.9° S; 38.4° W) were used in order to calculate the wave characteristics and amplitude of oscillation. The simulation results showed that the combined electrodynamical effect of tides and UFK waves in the MLT region could explain the oscillations observed in the ionospheric parameters.
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Hari, S. S., and B. V. Krishna Murthy. "Equatorial night-time F-region zonal electric fields." Annales Geophysicae 13, no. 8 (August 31, 1995): 871–78. http://dx.doi.org/10.1007/s00585-995-0871-8.

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Abstract. Night-time F-region vertical electrodynamic drifts at the magnetic equatorial station, Trivandrum are obtained for a period of 2 years, 1989 and 1990 (corresponding to solar cycle maximum epoch), using ionosonde h'F data. The seasonal variation of the vertical drift is found to be associated with the longitudinal gradients of the thermospheric zonal wind. Further, the seasonal variation of the prereversal enhancement of the vertical drift is associated with the time difference between the sunset times of the conjugate E-regions (magnetic field line linked to F-region) which is indicative of the longitudinal gradients of the conductivity (of the E-region). The vertical drifts and the causative zonal electric fields at Trivandrum are compared with those at Jicamarca and F-region zonal electric field models. It is seen that the night-time downward drift (as also the causative westward electric field) at Jicamarca is greater than that at Trivandrum. The prereversal enhancement of the drift is greater at Jicamarca than at Trivandrum during the summer and the equinoxes, whereas during the winter the opposite is the case.
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Sridharan, R., C. V. Devasia, N. Jyoti, Diwakar Tiwari, K. S. Viswanathan, and K. S. V. Subbarao. "Effects of solar eclipse on the electrodynamical processes of the equatorial ionosphere: a case study during 11 August 1999 dusk time total solar eclipse over India." Annales Geophysicae 20, no. 12 (December 31, 2002): 1977–85. http://dx.doi.org/10.5194/angeo-20-1977-2002.

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Abstract. The effects on the electrodynamics of the equatorial E- and F-regions of the ionosphere, due to the occurrence of the solar eclipse during sunset hours on 11 August 1999, were investigated in a unique observational campaign involving ground based ionosondes, VHF and HF radars from the equatorial location of Trivandrum (8.5° N; 77° E; dip lat. 0.5° N), India. The study revealed the nature of changes brought about by the eclipse in the evening time E- and F-regions in terms of (i) the sudden intensification of a weak blanketing ES-layer and the associated large enhancement of the VHF backscattered returns, (ii) significant increase in h' F immediately following the eclipse and (iii) distinctly different spatial and temporal structures in the spread-F irregularity drift velocities as observed by the HF radar. The significantly large enhancement of the backscattered returns from the E-region coincident with the onset of the eclipse is attributed to the generation of steep electron density gradients associated with the blanketing ES , possibly triggered by the eclipse phenomena. The increase in F-region base height immediately after the eclipse is explained as due to the reduction in the conductivity of the conjugate E-region in the path of totality connected to the F-region over the equator along the magnetic field lines, and this, with the peculiar local and regional conditions, seems to have reduced the E-region loading of the F-region dynamo, resulting in a larger post sunset F-region height (h' F) rise. These aspects of E-and F-region behaviour on the eclipse day are discussed in relation to those observed on the control day.Key words. Ionosphere (electric fields and currents; equatorial ionosphere; ionospheric irregularities)
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Farley, D. T. "The equatorial E-region and its plasma instabilities: a tutorial." Annales Geophysicae 27, no. 4 (April 2, 2009): 1509–20. http://dx.doi.org/10.5194/angeo-27-1509-2009.

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Abstract. In this short tutorial we first briefly review the basic physics of the E-region of the equatorial ionosphere, with emphasis on the strong electrojet current system that drives plasma instabilities and generates strong plasma waves that are easily detected by radars and rocket probes. We then discuss the instabilities themselves, both the theory and some examples of the observational data. These instabilities have now been studied for about half a century (!), beginning with the IGY, particularly at the Jicamarca Radio Observatory in Peru. The linear fluid theory of the important processes is now well understood, but there are still questions about some kinetic effects, not to mention the considerable amount of work to be done before we have a full quantitative understanding of the limiting nonlinear processes that determine the details of what we actually observe. As our observational techniques, especially the radar techniques, improve, we find some answers, but also more and more questions. One difficulty with studying natural phenomena, such as these instabilities, is that we cannot perform active cause-and-effect experiments; we are limited to the inputs and responses that nature provides. The one hope here is the steadily growing capability of numerical plasma simulations. If we can accurately simulate the relevant plasma physics, we can control the inputs and measure the responses in great detail. Unfortunately, the problem is inherently three-dimensional, and we still need somewhat more computer power than is currently available, although we have come a long way.
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Cousins, A. W. J., and J. A. R. Caldwell. "DDO photometry of E-region stars and equatorial standards -- II." Monthly Notices of the Royal Astronomical Society 281, no. 2 (July 11, 1996): 522–30. http://dx.doi.org/10.1093/mnras/281.2.522.

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Sinha, H. S. S., R. Pandey, Shweta Sharma, and R. N. Misra. "Nighttime E region plasma irregularities over an equatorial station Trivandrum." Journal of Atmospheric and Solar-Terrestrial Physics 73, no. 17-18 (November 2011): 2444–52. http://dx.doi.org/10.1016/j.jastp.2011.10.005.

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Chau, J. L., R. F. Woodman, and L. A. Flores. "Statistical characteristics of low-latitude ionospheric field-aligned irregularities obtained with the Piura VHF radar." Annales Geophysicae 20, no. 8 (August 31, 2002): 1203–12. http://dx.doi.org/10.5194/angeo-20-1203-2002.

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Abstract. We present a summary of the statistical characteristics of echoes from ionospheric (E- and F-region) field-aligned irregularities obtained with the Piura VHF radar. This radar is located at ~ 7.0° dip latitude, just outside the equatorial electrojet (EEJ) region. Our results are based on (1) intermittent observations made between 1991 and 1999 just few days a year, and (2) continuous observations made between January 2000 and June 2001. During most of the intermittent observations, simultaneous measurements of EEJ and equatorial spread F (ESF) irregularities were performed with the Jicamarca VHF radar. From the continuous measurements, we have obtained the diurnal and seasonal characteristics of a variety of parameters (percentage of occurrence, signal-to-noise ratio and/or Doppler velocities) from the lower and upper E-region irregularities and also from F-region irregularities over Piura. For example, we have found that (1) the E-region echoes are stronger and occur more frequently during local summer (i.e. between December and March); (2) between May and June, the E-region echoes are weaker and occur less frequently; moreover, during these months, a semidiurnal wave with large amplitudes is observed in the meridional wind (> 100 ms- 1); (3) there is vertical wavelength of about 20 km in the Doppler velocity, particularly after midnight; (4) the lower (upper) E-region Doppler velocities are influenced mainly by meridional winds (equatorial F-region vertical drifts). In addition, we have observed that the seasonal and daily occurrences of Piura F-region irregularities are similar to the occurrence of topside ESF irregularities over Jicamarca. The likelihood of occurrence of F-region irregularities over Piura and, therefore, topside ESF over Jicamarca is greater when there are no E-region irregularities over Piura. On the other hand, there is more probability of observing bottomtype/bottomside ESF irregularities over Jicamarca when E-region irregularities are observed over Piura.Key words. Ionosphere (ionospheric irregularities; equatorial ionosphere; instruments and techniques)
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Oppenheim, Meers M., Axel F. vom Endt, and Lars P. Dyrud. "Electrodynamics of meteor trail evolution in the equatorial E-region ionosphere." Geophysical Research Letters 27, no. 19 (October 1, 2000): 3173–76. http://dx.doi.org/10.1029/1999gl000013.

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Dissertations / Theses on the topic "Equatorial E-region"

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Aveiro, Henrique Carlotto. "Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region." Instituto Nacional de Pesquisas Espaciais, 2009. http://urlib.net/sid.inpe.br/mtc-m18@80/2008/12.16.11.31.

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Observações do eletrojato equatorial (EEJ) utilizando radares VHF mostram ecos retro-espalhados em dois tipos de irregularidades de densidade eletrônica, explicadas pelas instabilidades de dois-feixes modificada (ecos Tipo I) e deriva de gradiente (ecos Tipo II). Das velocidades das irregularidades Tipo II obtidas de dados de radar, inferimos os campos elétricos verticais (E_z). A análise harmônica de tais campos mostra a presença de campos elétricos induzidos por ondas de gravidade (GW) no EEJ. Calculamos a razão entre os campos elétricos relacionados a GW e o campo elétrico vertical total. Este fator é um indicador da eficiência na produção de um campo elétrico causado por um vento neutro devido a uma onda de gravidade. Também, analisamos os efeitos da atividade da onda planetária de 2 dias no EEJ utilizando um radar coerente e oito magnetômetros instalados próximos ao equador magnético. A análise de wavelets dos dados de magnetômetros revela uma assinatura de 2 dias na maré semidiurna geomagnética. O campo elétrico ionosférico zonal da região E, derivado de medidas de radar coerente, mostra oscilações de 2 dias, em acordo com tais observações nos dados de magnetômetros. Uma anti-correlação entre as periodicidades de marés (diurna e semi-diurna) e a assinatura de dois dias é também mostrada nos campos elétricos. Os resultados são comparados com observações simultâneas de ondas planetárias de dois dias nos ventos meridionais e ionossondas disponíveis na literatura. Finalmente, nossos resultados são discutidos com base na análise da atividade magnética do período.
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic analysis of such fields shows the presence of gravity waves-induced electric fields in the EEJ. We calculated the ratio between GW-related electric fields and the total E_z. This factor is an indicator of the efficiency in the production of an additional electric field due to a gravity wave neutral wind. Also, we analyze the effects of the 2-day wave activity in the EEJ using one coherent radar and eight magnetometer stations located dose to the dip equator. The wavelet analysis of the magnetometer data reveals a 2-day signature in the semidiurnal geomagnetic tide. The E-region zonal background ionospheric electric field derived from coherent radar measurements shows 2-day oscillations in agreement with such oscillations in the magnetometer data set. An anticorrelation between the tidal periodicites (diurnal, and semidiurnal) and the 2-day signature is also shown in the electric fields. The results are compared with simultaneous observations of 2-day planetary wave in meridional winds and ionosondes available in the literature. Our results are discussed based on the analysis of the magnetic activity.
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Fern, C. L., and 馮志龍. "Simulations of Pure Two-Stream Waves in the Equatorial E-region Ionosphere." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74234128445303163268.

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博士
國立中央大學
太空科學研究所
89
At the altitude range of 95∼110 km in the equatorial E-region ionosphere, a large current in the magnetic equator called the equatorial electrojet is created by a dynamic process involving atmospheric tides. The equatorial electrojet causes the medium to be unstable to generate plasma waves. Radar observations have shown the existence of two classes of plasma waves, called typeⅠand typeⅡ. The typeⅠwave resulting from the two-stream instability is also called two-stream wave. In this paper, the behavior of two-stream wave in the plane perpendicular to the Earth's magnetic field is simulated by a two-dimensional fluid model simulation code in which the electron inertia is neglected while the ion inertia is retained. We consider the suitable two-dimensional simulation space (27×54m ) and successfully excite the dominant 3-meter wave compatible with VHF radar echoes. The analysis methods of two-dimensional Fourier series are derived to express the time variation of mode powers and ω spectra. From the series of simulation results for two-stream waves in the equatorial E-region ionosphere, we have studied the dispersion relations, the resonant coupling, and the echo power variation with the zenith angle rate of approximately 0.3(dB/degree). We have also studied the vertical small-scale waves developed from the distortions of the dominant waves. The vertical waves will cause dominant waves to turn away from the electrojet drift direction (E×B ). The important point about the development of vertical modes is asymmetry. We find that the spectral asymmetry depends on the scale size of plasma waves, that is, the large-scale waves (above 3 meters) propagate in the k‧E＜0 region, and the small-scale (smaller than 3 meters) propagate in the k‧E＞0 region. The simulation result of up-down asymmetry for 3-meter wave is consistent with the radar observations. We believe that the background polarization electric field E driving the electrojet is responsible for the spectral asymmetries. In the same time, owning to the strong and fixed background polarization electric field E , the wave frequency depends only on horizontal wave number Kx . Therefore, the phase velocities of many obliquely propagating two-stream waves (Kz≠0 ) are below the value predicted by linear theory, and this characteristic is prominent especially for large-scale waves.
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Books on the topic "Equatorial E-region"

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Estimating Equatorial F-Region Daytime Vertical E x B Drift Velocities from Ground-Based Magnetometer Measurements in the Philippine Longitude Sector. Storming Media, 2004.

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Conference papers on the topic "Equatorial E-region"

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Denardini, Clezio Marcos. "A Conductivity Model for the Brazilian Equatorial E-Region." In 9th International Congress of the Brazilian Geophysical Society & EXPOGEF, Salvador, Bahia, Brazil, 11-14 September 2005. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2005. http://dx.doi.org/10.1190/sbgf2005-435.

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Marcos Denardini, Clezio. "A Conductivity Model for the Brazilian Equatorial E-Region." In 9th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.160.sbgf435.

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Suclupe, Jose M., Edgardo E. Pacheco, and Percy J. Condor. "Automatic identification and observations of blanketing sporadic E events in the equatorial region over Jicamarca." 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/ursigass49373.2020.9232028.

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Rajana, Siva Sai Kumar, Sampad Kumar Panda, and Sridevi Jade. "Characteristics of Equatorial F-region Irregularities along the 90°E Meridian during High Solar Activity Phase." In 2022 URSI Regional Conference on Radio Science (USRI-RCRS). IEEE, 2022. http://dx.doi.org/10.23919/ursi-rcrs56822.2022.10118463.

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Samanes, Jorge, and Fernanda Florez. "Analysis of the nighttime lower ionosphere for equatorial, low and middle latitudes over a region from 30°E and 60°E." 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/ursigass49373.2020.9232313.

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Muralikrishna, P., I. S. Batista, and M. A. Abdu. "Solar and Magnetic Declination Control of the Pre-Reversal Enhancement in the Equatorial E- and F-Region Electric Fields." In 2nd International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1991. http://dx.doi.org/10.3997/2214-4609-pdb.316.6.

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Muralikrishna, P., I. S. Batista, and M. A. Abdu. "PRE-REVERSAL ENHANCEMENT IN THE EQUATORIAL E AND F REGION ELECTRON DRIFT, VELOCITIES AND ITS SEASONAL VARIATION - AN EXPLANATION." In 1st International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1989. http://dx.doi.org/10.3997/2214-4609-pdb.317.sbgf166.

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Denardini, C. M., H. C. Aveiro, P. D. S. C. Almeida, L. C. A. Resende, J. V. Bageston, E. P. A. Olívio, L. M. Guizelli, and C. M. Wrasse. "New Features of the Field-Aligned-Integrated Conductivity Model for the Brazilian Equatorial E-Region and the Implication on the Collision Rates." In 11th International Congress of the Brazilian Geophysical Society & EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2009. http://dx.doi.org/10.1190/sbgf2009-022.

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Denardini, C. M., E. P. A. Olívio, H. C. Aveiro, P. D. S. C. Almeida, L. C. A. Resende, L. M. Guizelli, C. M. Wrasse, and J. V. Bageston. "New Features Of The Field-Aligned-Integrated Conductivity Model For The Brazilian Equatorial E-Region And The Implication On The Collision Rates." In 11th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.195.1616_evt_6year_2009.

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