Solar activity variations of equivalent winds derived from global ionosonde data

Details Solar activity variations of equivalent winds derived from global ionosonde data Solar activity variations of equivalent winds derived from global ionosonde data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10912305l&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A12, CiteID A12305

Physics

13

Ionosphere: Ionosphere/Atmosphere Interactions (0335), Meteorology And Atmospheric Dynamics: Thermospheric Dynamics (0358), Meteorology And Atmospheric Dynamics: Climatology (1620), Interplanetary Physics: Solar Cycle Variations (7536)

Scientific paper

The equivalent winds at the F layer peak are derived from global ionosonde data to investigate their solar activity variations. With increasing solar activity, the derived equivalent winds are found of nonlinearly decreased diurnal amplitudes in all seasons at most stations. This implies that the increase in ion drag more than compensates for pressure gradients and thus restrains the diurnal amplitude at high solar activity. The diurnal phase of the derived equivalent winds generally shifts later at higher solar activity. It is the first time to explicitly report this striking feature that emerged at so many stations. Another pronounced feature is that the diurnal phase has a summer-winter difference. The diurnal phases at most stations in the Northern Hemisphere are later in winter than in summer at higher solar activity. Furthermore, a decrease in the semidiurnal amplitudes of equivalent winds with increasing solar activity is evident in winter over most stations considered and in other seasons at stations with a lower dip, but the decrease trend becomes weak in other seasons at stations with a larger dip. However, complicated dependences on solar activity can be found in the diurnal mean and the semidiurnal phases of equivalent winds at stations considered.

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