The main results of the research
The main results of the research are:
Figure 3. The example of Ne distribution in the topside ionosphere from the Intercosmos-19 data for the case of occurrence of the low-latitude trough at the equatorial anomaly Southern crest at night hours in December solstice at solar maximum. Figures at the curves are Ne values to be multiplied by 105 cm-3, hs is the satellite height.
- From the Cosmos-1809, Intercosmos-19 and Cosmos-900 satellite data the ring ionospheric trough, RIT, associated with the ring magnetospheric current and SAR-arcs was revealed and its characteristic were in detail investigated.
- From the Cosmos-900 in situ measurement data, two branches of the trough in the day-side winter ionosphere have been separated: the day-side main ionospheric trough which is observed in the region of "full shadow" and so called "Muldrew trough" which is mainly observed at sunlit longitudes in the auroral region.
- The mid-latitude trough associated with the plasmapause and low-latitude sub-trough in the light ions at the altitudes about 1000 km have been isolated from the ISS-b satellite. The occurrence probability dependence of the both troughs on season, local time, longitude and magnetic activity was investigated.
- A new type of the low-latitude trough in NmF2 have been revealed from the Intercosmos-19 topside sounding data which was observed mainly in December solstice in the equatorial anomaly Southern crest region (see Figure 3).
- The procedure for the both meridional and zonal wind calculations from the hmF2 longitudinal variations have been developed on the base of the Tikhonov's regularization method.