Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/4355
Title: IMF polarity effects on the equatorial ionospheric F-region
Authors: Sastri, J. H
Keywords: Equatorial Atmosphere;Equinoxes;F Region;Interplanetary Magnetic Fields;Ionosondes;Sunspot Cycle;Earth Ionosphere;Geomagnetism;Polarity
Issue Date: 1985
Citation: Advances in Space Research, Vol. 5, No. 4, pp. 199 - 203
Abstract: An exploratory study is made of the influence, during the equinoxes, of the interplanetary magnetic field (IMF) sector structure on the ionospheric F-region using ionosonde data from several equatorial stations for a 3-yr period around the 19th sunspot cycle maximum. It is found that, compared with days having positive IMF polarity, the post-sunset increase of h'F near the dip equator and the depth of the equatorial ionization anomaly (EIA) are reduced during the vernal equinox and enhanced during the autumnal equinox on days with negative IMF polarity. Similar trends are also noted in the data for the 20th sunspot cycle maximum, but with reduced amplitude. The systematic changes in the F-region characteristics suggest a modification of the equatorial zonal electric fields in association with the IMF polarity-related changes in the semi-annual variation of geomagnetic activity.
Description: Restricted Access
URI: http://hdl.handle.net/2248/4355
ISSN: 0273-1177
???metadata.dc.relation.uri???: http://adsabs.harvard.edu/abs/1985AdSpR...5..199S
http://dx.doi.org/10.1016/0273-1177(85)90138-3
Appears in Collections:IIAP Publications

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