A comparison of the ionospheric equatorial anomaly in the East Asian and the American regions at sunspot minimum

Details A comparison of the ionospheric equatorial anomaly in the East Asian and the American regions at sunspot minimum A comparison of the ionospheric equatorial anomaly in the East Asian and the American regions at sunspot minimum

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..589w&link_type=abstract

(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri

Physics

11

Equatorial Atmosphere, F Region, Ionospheric Disturbances, Magnetic Anomalies, Magnetic Equator, Sunspots, Annual Variations, Asia, Lines Of Force

Scientific paper

Using f0F2 and M(3000)F2 data, taken at stations spread over narrow longitude ranges and giving a good coverage of dip location near the magnetic equator, a comparison has been undertaken of the diurnal variations of the ionospheric equatorial anomaly at different seasons in East Asia and America. The very significant differences observed have been explained in terms of (1) the relative inferred locations of the thermal pressure bulges with respect to the magnetic equator, (2) magnetic declination effects (only significant at high latitudes in South America) and (3) the greater magnetic field in Asia. For both regions maximum symmetry of the equatorial anomaly crests has been observed in the particular month for which the midday overhead sun occurred near the magnetic equator. The equatorial anomaly was found to persist later at the solstices in America but at equinox it persisted until 0300-0400 LT in both regions.

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