A study of the equatorial anomaly at American longitudes during sunspot minimum

Details A study of the equatorial anomaly at American longitudes during sunspot minimum A study of the equatorial anomaly at American longitudes during sunspot minimum

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..475s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 38, May 1976, p. 475-484.

Physics

4

F 2 Region, Solar Activity Effects, Tropical Meteorology, Alouette Satellites, Annual Variations, Diurnal Variations, Equatorial Electrojet, Magnetic Effects, Plasma Frequencies, Satellite Observation, Sunspots

Scientific paper

The paper studies the form and development of the equatorial anomaly near the peak of the F2 layer during different seasons at American longitudes (near 75 deg W) for a period of low solar activity on the basis of data obtained by the topside sounder on board of Alouette 1. The parameter considered is foF2, the ordinary-wave plasma frequency at the layer peak, which is determined from the magnetic field and the extraordinary-wave plasma frequency as published in the Alouette synoptic data. It is shown that the anomaly disappears during the evening hours in D-months (Nov., Dec., Jan., and Feb.) as compared to E-months (Mar., Apr., Sept., and Oct.) or J-months (May, June, July, and Aug.). Data on the position of anomaly crests in both northern and southern hemispheres are given for each seasonal group, with anomaly assymetries occurring near solstitial months and the sense being reversed at night. Changes in the equatorial anomaly may be due to weakening of the equatorial electrojet during disturbed conditions.

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