• P Velayudhan Nair

      Articles written in Journal of Earth System Science

    • HF doppler observations on the occurrence of equatorial spread-F

      B T Vikram Kumar P Velayudhan Nair P B Rao

      More Details Abstract Fulltext PDF

      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 fewESF (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 theESF days, however, the corresponding values are found to be in the range of 400–650 km and 30–50 m/sec. TheESF 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.

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