Earth's equatorial ionosphere and the heliospheric current sheet

Details Earth's equatorial ionosphere and the heliospheric current sheet Earth's equatorial ionosphere and the heliospheric current sheet

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986em%26p...35...85h&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 35, May 1986, p. 85-91.

Physics

1

Current Sheets, Earth Ionosphere, Equatorial Atmosphere, Geomagnetism, Heliosphere, Solar Activity Effects, Solar Terrestrial Interactions, Sunset, Sunspots

Scientific paper

Evidence is presented to show that during epochs of high sunspot activity, the duration of manifestation of equatorial spread-F (ESF) irregularities in the earth's equatorial ionosphere undergoes a systematic modulation around the times of crossing of the heliospheric current sheet by the earth. The modulation which is assessed as an indirect and 'geomagnetic activity-associated effect', is characterized by an enhancement in the duration of ESF conditions prior to the current sheet crossing and a reduction thereafter. It is suggested that the observed response of the equatorial ionosphere to the current sheet passage is primarily a manifestation of the geomagnetic activity related modifications in the equatorial east-west electric field in the post-sunset period.

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