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| Titel |
HF Doppler radar observations of sporadic E at an Indian low latitude station, Visakhapatnam |
| VerfasserIn |
M. S. S. R. K. N Sarma, C. Raghava Reddy, K. Niranjan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 2 ; Nr. 27, no. 2 (2009-02-02), S.537-545 |
| Datensatznummer |
250016393
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| Publikation (Nr.) |
 copernicus.org/angeo-27-537-2009.pdf |
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| Zusammenfassung |
| 5.5 MHz HF Doppler radar observations of Sporadic E over an Indian low
latitude station, Visakhapatnam (17.7° N, 83.3° E and Dip 20°)
with 10 s resolution showed quasi-periodic variations of the echo
strength and Doppler velocity variations with periods of a few minutes to a
few tens of minutes. The echo strength and Doppler velocity variations with
time in different range bins of the ES echo showed variations which are
some times similar and some times significantly different in successive
range bins at intervals of 7.5 km. The ES echo occurs with the height
of maximum echo strength in the range of 100 km to 120 km and some times at
130 km. The altitude variation of the average Doppler velocity is highly
variable and the height of maximum echo strength is not the same as the
height of maximum Doppler velocity. Observations of ES echoes at
different times of the day are presented to bring out the differences
between the day and night time ES echoes. The relationship between
Radar and ES parameters derived from Ionograms is poorer than that of
mid latitudes which is quite consistent with the expectations based on
gradient drift instability. |
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