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Typical disturbances of the daytime equatorial f region observed with a high-resolution hf radar (1996).
| Content Provider | CiteSeerX |
|---|---|
| Author | Blanc, E. Houngninou, E. |
| Abstract | 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 Electro-jet 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 fluctuations 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 influence and equatorial electric fields. The possibility of retrieving the ionospheric electric fields from these Doppler or height variation measure-ments in the presence of the other possible equatorial ionospheric disturbances is discussed. 1 |
| File Format | |
| Publisher Date | 1996-01-01 |
| Access Restriction | Open |
| Subject Keyword | Typical Disturbance High-resolution Hf Radar Daytime Equatorial Region Height Variation Hf Radar Equatorial Electric Field Amplitude Fluctuation Magnetic Equator Ionospheric Electric Field Gravity Wave High Resolution Zenithal Radar Variation Measure-ments Comparative Study Echo Parameter Magnetometer Measurement International Equatorial Electro-jet Year Dierent Magnetic Condition Larger-scale Disturbance Solar Daytime Influence Small-scale Instability Daytime Ionospheric Structure F-region Peak Doppler Spectrum Dierent Altitude Large Echo Width Broad Doppler Spectrum Hf Radar Measurement Several Frequency Possible Equatorial Ionospheric Disturbance |
| Content Type | Text |
| Resource Type | Article |
