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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 2
Ann. Geophys., 27, 537–545, 2009
https://doi.org/10.5194/angeo-27-537-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 537–545, 2009
https://doi.org/10.5194/angeo-27-537-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  02 Feb 2009

02 Feb 2009

HF Doppler radar observations of sporadic E at an Indian low latitude station, Visakhapatnam

M. S. S. R. K. N Sarma, C. Raghava Reddy, and K. Niranjan M. S. S. R. K. N Sarma et al.
  • Department of Physics, Andhra University, Visakhapatnam 530 003, India

Abstract. 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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