Other
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..357b&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, May 1990, p. 357-364.
Other
10
Geomagnetism, Ionosondes, Magnetic Effects, Plasma Drift, Spread F, Atmospheric Models, Equatorial Regions, Equinoxes, Magnetospheric Instability
Scientific paper
Ionosonde measurements are used to study the effects of magnetic activity on spread F and on the postsunset enhancement, V(z-max), of the F vertical plasma drift at two longitudinally separated stations, Fortaleza and Huancayo, situated along the magnetic equator, in the American sector, during a period of high solar activity. The analysis is made for three different levels of magnetic activity. It is seen that, during the winter, V(z-max) and the range spread F occurrence (RSFO) in the premidnight hours systematically increase with Kp at both locations. During the summer and equinoxes the RSFO decreases with magnetic activity in the premidnight hours and increases in the postmidnight hours, the increase being generally more pronounced during very disturbed periods. On the other hand, V(z-max) deduced from ionosonde measurements shows almost no variation with magnetic activity during equinoxes and summer although during individual months of those periods both increases and decreases are seen. With the help of theoretical model calculations for the electrodynamical coupling between the equatorial E and F regions it is shown that a disturbance F region dynamo associated neutral wind could account for the variations of V(z-max) with magnetic activity, that are consistently observed during the winter months.
Abdu Mangalathayil Ali
Batista Inez S.
Medrano R. A.
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