TitleFirst observational evidence of the modulation of the threshold height h'F c for the occurrence of equatorial spread F by neutral composition changes
Publication TypeJournal Article
Year of Publication2013
AuthorsHaridas, MKMadhav, Manju, G, Pant, TKumar
JournalJournal of Geophysical Research: Space Physics
Volume118
Issue6
Pagination3540 - 3545
Date Published06/2013
KeywordsEquatorial Spread F; O/N2; solar activity; threshold height
Abstract

[1] In the present study, the seasonal and solar activity variations of the threshold height for equatorial spread F occurrence irrespective of the polarity of the meridional winds during magnetically disturbed period are presented for the first time. The modulation of the seasonal pattern of the threshold height by the seasonal mean O/N2 values is also examined. The Ionosonde data of magnetic equatorial location Trivandrum (8.5°N, 76.5°E) and low latitude station SHAR (13.7°N, 80.2°E) in the Indian longitude sector during equinoxes, winter, and summer seasons of 2002 to 2006 and the corresponding Thermosphere Ionosphere Mesosphere Energetics and Dynamics/GUVI (Global Ultra Violet Imager) O/N2 data are used for the study. The important findings that have emerged from this study are (i) the substantial increase of threshold height with magnetic activity for all the seasons and (ii) the modulation of h'Fc by neutral density changes, irrespective of season, solar, or magnetic activity.

URLhttp://doi.wiley.com/10.1002/jgra.50331
DOI10.1002/jgra.50331
Short TitleJ. Geophys. Res. Space Physics


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