Subsidiary maxima in late evening N(m)F2 at a low latitude station at solar maximum

Details Subsidiary maxima in late evening N(m)F2 at a low latitude station at solar maximum Subsidiary maxima in late evening N(m)F2 at a low latitude station at solar maximum

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..573b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, June 1988, p. 573-578. Research supported by the Unive

Physics

8

F 2 Region, Ionospheric Disturbances, Solar Activity, Equatorial Electrojet, Maxima, Spread F, Tropical Regions

Scientific paper

At solar maximum during the late evening hours (2100-2400 LT), N(m)F2 at Tahiti frequently does not decrease monotonically but exhibits temporary subsidiary maxima. Thus, in 1980, of 66 evening periods for which good data were available, 20 showed monotonic decreases but the remainder exhibited such subsidiary maxima. In summer the subsidiary maxima correspond to hmF2 significantly lower than the monotonic decreases. This lower hmF2 during subsidiary maxima corresponds to a weakening or reversal of the equatorward neutral wind, accompanied by an increase in the flux from the equatorial fountain. In winter the subsidiary maxima are fully accounted for by increases in the flux from the fountain effect, probably due to increases in the strength of the equatorial electrojet.

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