Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714897a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,897-14,904.
Physics
49
Dynamo Theory, Equatorial Atmosphere, F Region, Geomagnetism, Spread F, E Region, Plasma Bubbles, Solar Cycles
Scientific paper
Low-latitude range spread F (RSF) data were collected over 12 yr to study seasonal variation of the RSF data. The analysis emphasizes the appearance of two secondary minima that correspond with the appearance of a pair of nodes at the magnetically conjugate E-layer sunset local times. A model for the minima is developed describing asymmetric conjugate E-layer decay conditions and simple development of the F-region dynamo. Magnetic declination angle is shown to play a significant role in spread F plasma-bubble development caused by seasonal qualities of the evening F-region dynamo electric field. The seasonal variations in vertical drift and RFS, however, are not identical as predicted by theory. The observations and derived correlations suggest that the conditions of spread F onset include F-region vertical drift and height gradient.
Abdu Mangalathayil Ali
Batista Inez S.
Sobral José Humberto A.
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