Doppler sounding as a tool for the study of the MHD wave structure in the magnetosphere
| Autor: | E. N. Fedorov, V. Pilipenko, A. V. Volgin, S. N. Pokhil'Ko, L.S. Alperovich |
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| Rok vydání: | 1991 |
| Předmět: |
Physics
Atmospheric Science General Engineering Magnetosphere Geophysics F region Ionospheric sounding Physics::Geophysics symbols.namesake Depth sounding Physics::Space Physics symbols Astrophysics::Solar and Stellar Astrophysics General Earth and Planetary Sciences Ionosphere Magnetohydrodynamics Doppler effect General Environmental Science Radio wave |
| Zdroj: | Journal of Atmospheric and Terrestrial Physics. 53:581-586 |
| ISSN: | 0021-9169 |
| DOI: | 10.1016/0021-9169(91)90086-m |
| Popis: | The results of the experiment conducted in 1987 near Kharkov to develop a technique for the study of the spatial structure of MHD waves at ionospheric heights are discussed. Simultaneous digital Doppler soundings for 6 radiopaths (1–6 MHz) and ULF magnetic recordings were performed. To retrieve the ionospheric signal induced by an MHD wave optimal filtering was applied. The ~2nT Pi2 pulsations recorded on the ground correspond to ~ 15 m/s Doppler velocity in the F-layer. Analytical expressions for the ULF-related ionospheric Doppler effect have been derived in the framework of the ‘thin’ ionosphere. Some modifications are needed to achieve satisfactory quantitative agreement between the present theoretical estimates and experimental results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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