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On the equinoctial asymmetry in the threshold height for the occurrence of equatorial spread F



AuthorManju, G.; Haridas, M.K.;
KeywordsThreshold height; O/N2; Equinoctial asymmetry; Solar flux
Abstract

In the present study, the threshold height (h Fc) for ESF occurrence irrespective of the polarity of the meridional winds during vernal and autumnal equinoxes is investigated using a large database spread over 1993\textendash2008. The characteristics of the thermosphere during the two equinoxes have also been examined using TIMED/GUVI O/N2 data. The major aspects that have emerged are (i) presence of significant equinoctial asymmetry inh Fc\ for the years examined, (ii) increase in the equinoctial asymmetry of\ h Fc\ with solar activity, (iii) presence of significant asymmetry in O/N2\ and TIEGCM simulations of normalized atomic oxygen mass density, between the two equinoxes.

Year of Publication2015
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume124
Number of Pages59-62
Section
Date Published03/2015
ISBN
URLhttp://www.sciencedirect.com/science/article/pii/S1364682615000103
DOI10.1016/j.jastp.2015.01.008