VHF ionospheric scintillations near the equatorial anomaly crest: solar and magnetic activity effects |
| |
| Affiliation: | 1. Saint-Petersburg State University of Aerospace Instrumentation, 67, Bolshaya Morskaya street, Saint-Petersburg 190000, Russia;2. Institute for Physics, Southern Federal University, Stachki, 194, Rostov-on-Don 344090, Russia;3. Physical Department, Southern Federal University, Sorge, 5 Rostov-on-Don 344090, Russia;4. SCiESMEX, Instituto de Geofisica, Unidad Michoacan, Universidad Nacional Autonoma de Mexico, Morelia, Michoacan, CP 58190, Mexico;5. Arctic and Antarctic Research Institute, 38 Bering street, Saint-Petersburg 199397, Russia;1. Pwani University, Department of Mathematics and Physical Sciences, Box 195-80108, Kilifi, Kenya;2. China Research Institute of Radiowave Propagation, No. 36, Xianshandong Road, Chengyang District, Qingdao, China;1. Department of Physics, University of Lagos, Yaba, Lagos, Nigeria;2. Department of Physical Sciences, Chrisland University, Owode, Abeokuta, Nigeria;1. School of Agricultural, Computational and Environmental Science, University of Southern Queensland, Springfield, Australia;2. School of Engineering and Physics, The University of the South Pacific, Suva, Fiji |
| |
| Abstract: | ![]()
The paper presents a study of solar and magnetic activity effects on VHF ionospheric scintillations recorded during three and half years at Bhopal, a station near the northern crest of the equatorial anomaly in India. During E- (equinox) and D- (winter) months, scintillations occur mainly in the pre-midnight period whereas during J- (summer) months their occurrence is larger in the post-midnight period. Very intense scintillations (>20 dB) mainly occur in the pre-midnight period, and in the post-midnight period, the scintillations are generally moderate (5–10 dB) or weak (<5 dB). The nocturnal scintillation occurrence decreases with the decrease in solar activity from 1989 to 1992. Monthly mean scintillation occurrence changes according to solar activity during E- and D-months but not so during J-months. The effects of magnetic activity on scintillations vary with season and, in general, inhibit the scintillation occurrence in the pre-midnight period and enhance it a little in the post-midnight period, especially after 0300 hours IST (Indian Standard Time). For most of the severe magnetic storms in which Dst goes below −125 nT and the recovery phase starts in the post-midnight to dawn local time sector, strong post-midnight scintillations, which sometimes extend for several hours beyond the local sunrise, are observed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
