Seasonal and solar cycle association of zonal drifts of ionospheric plasma irregularities in the Indian equatorial region

Details Seasonal and solar cycle association of zonal drifts of ionospheric plasma irregularities in the Indian equatorial region Seasonal and solar cycle association of zonal drifts of ionospheric plasma irregularities in the Indian equatorial region

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996angeo..14..297p&link_type=abstract

Annales Geophysicae, vol. 14, Issue 3, pp.297-303

Physics

3

Scientific paper

Long series of simultaneous VHF scintillation observations at two stations situated in near magnetic east-west direction in the vicinity of the dip equator in the Indian region have been employed to investigate the night-time ionospheric plasma zonal drifts. The drifts are found to be predominantly easterly. On comparing the magnitudes of the drifts with those results derived earlier by HF fading technique, monitoring signals from two satellites at a station and spaced receiver experiment, their associations with the season and the degree of solar activity are discussed. On a broader scale, the annual mean sunspot number is shown to have a direct control on the derived drift, the positive relationship even on day to day basis with the solar flux is established. However, the relationship, as understood by the slope of the best fit line, in the Indian region (0.27) is found to be weaker when compared with the similar slope (0.45) in the American sector. There appears to be no geomagnetic activity control on the estimated drifts. Acknowledgements. The research described in this publication was made possible in part by Grant JDG100 from the International Science Foundation and Russia Government. I would like to thank Dr. P. G. Richards and an anonymous referee for critical reading of the manuscript as reviewers and for helpful comments. Topical Editor, J.-C. Geŕard thanks P. G. Richards and J. Kozyra for their help in evaluating this paper.-->

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