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Typical disturbances of the daytime equatorial F region observed with a high-resolution HF radar
| Content Provider | Semantic Scholar |
|---|---|
| Author | Blanc, Erémy |
| Copyright Year | 1998 |
| Abstract | HF radar measurements were performed near the magnetic equator in Africa (Korhogo 9°24¢63¢¢N± 5°37¢38¢¢W) during the International Equatorial Electrojet Year (1993±1994). The HF radar is a high±resolution zenithal radar. It gives ionograms, Doppler spectra and echo parameters at several frequencies simultaneously. This paper presents a comparative study of the daytime ionospheric structures observed during 3 days selected as representative of dierent magnetic conditions, given by magnetometer measurements. Broad Doppler spectra, large echo width, and amplitude ̄uctuations revealed small-scale instability processes up to the F-region peak. The height variations measured at dierent altitudes showed gravity waves and larger-scale disturbances related to solar daytime in ̄uence and equatorial electric ®elds. The possibility of retrieving the ionospheric electric ®elds from these Doppler or height variation measurements in the presence of the other possible equatorial ionospheric disturbances is discussed. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.ann-geophys.net/16/721/1998/angeo-16-721-1998.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Altitude Doppler effect Echo (command) Electroconvulsive Therapy Hafnium Helicon Filter Image resolution Instability Large Radar Region-based memory management Skywave magnetometers width |
| Content Type | Text |
| Resource Type | Article |
