TitleOn the equinoctial asymmetry in the threshold height for the occurrence of equatorial spread F
Publication TypeJournal Article
Year of Publication2015
AuthorsManju, G, Haridas, MKMadhav
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Pagination59 - 62
Date Published03/2015
KeywordsThreshold height, O/N2, Equinoctial asymmetry, Solar flux

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 1993–2008. 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.

Short TitleJournal of Atmospheric and Solar-Terrestrial Physics

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