Electrodynamics of the equatorial F-region ionosphere during pre-sunrise period
| Autor: | Tiju Joseph Mathew, C. V. Sreehari, C. V. Devasia, S. G. Sumod, S. R. Prabhakaran Nayar, V. Sreeja, Sudha Ravindran, R. Sridharan, T. Kumar Pant |
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| Rok vydání: | 2009 |
| Předmět: |
Atmospheric Science
Doppler radar Sunset F region law.invention Physics::Popular Physics law Earth and Planetary Sciences (miscellaneous) Astrophysics::Solar and Stellar Astrophysics Sunrise Radar lcsh:Science Physics lcsh:QC801-809 Excursion Geology Astronomy and Astrophysics Geophysics lcsh:QC1-999 Physics::History of Physics lcsh:Geophysics. Cosmic physics Space and Planetary Science Quantum electrodynamics Physics::Space Physics lcsh:Q Ionosphere Ionosonde lcsh:Physics |
| Zdroj: | Annales Geophysicae, Vol 27, Iss 1, Pp 107-111 (2009) Annales Geophysicae, Vol 27, Pp 107-111 (2009) |
| ISSN: | 1432-0576 |
| Popis: | The electrodynamics of the pre-sunrise equatorial F-region is investigated using HF Doppler radar and digital ionosonde. The observations are limited to those days for which the radar probing frequency is below the foF2 value. The ionosphere observation using HF Doppler radar exhibit interesting features during pre-sunrise period similar to the post sunset pre-reversal enhancement. The most striking feature observed during pre-sunrise period is the sudden downward excursion in the vertical drift around local sunrise followed by an upward turning. Pre-sunrise observations of vertical plasma drift and the sunrise downward excursion followed by an upward turning after the ground sunrise related to the zonal electric field at the equatorial F-region are the most significant results not reported earlier. |
| Databáze: | OpenAIRE |
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