HF Doppler observations on the occurrence of equatorial spread-F

Vikram Kumar, B. T. ; Velayudhan Nair, P. ; Rao, P. B. (1985) HF Doppler observations on the occurrence of equatorial spread-F Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 94 (3). pp. 261-267. ISSN 0253-4126

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Official URL: http://www.ias.ac.in/j_archive/epsci/94/3/261-267/...

Related URL: http://dx.doi.org/10.1007/BF02839203


HF doppler observations of the vertical drift velocity and group height of the 5.5 MHz plasma frequency level of the post-sunset bottomside F-region obtained on a few ESF (equatorial spread-F) and non-ESF days at Trivandrum are presented. The results show that on the non-ESF days, the maximum group height attained is about 400 km and the maximum velocity is less than 30 m/sec. On the ESF days, however, the corresponding values are found to be in the range of 400-650 km and 30-50 m/sec. The ESF onset is found to be significantly delayed relative to the velocity peak indicating that it is more closely linked to the layer height than to the drift velocity.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:HF Doppler Observations; Vertical Shift Velocity; Group Height; Equatorial Spread-F; Drift Velocity; Layer Height
ID Code:86793
Deposited On:13 Mar 2012 11:38
Last Modified:19 May 2016 02:14

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