Ionosphere as a sensor of the heliosphere affecting the Earth

Details Ionosphere as a sensor of the heliosphere affecting the Earth Ionosphere as a sensor of the heliosphere affecting the Earth

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16..175g&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 9, p. (9)175-(9)180

Physics

1

Earth Ionosphere, Heliosphere, Interplanetary Magnetic Fields, Solar Terrestrial Interactions, Sunspot Cycle, Auroral Electrojets, Current Sheets, Magnetic Dipoles, Periodic Variations, Solar Corona

Scientific paper

Two factors affecting the ionosphere disturbances are considered: (1) the solar corona and the heliospheric current sheet orientation with respect to the Earth during the sunspot cycle, and (2) twilight conditions at different latitudinal zones. Formulae for determining day of edgewise orientation of the solar corona towards the Earth are derived. It is shown that enhanced disturbances in the auroral electrojet occur when the interplanetary magnetic field (IMF) polarity deduced from geomagnetic data has the least departures from parameter of orientation of the solar corona and the heliospheric current sheets (HCS). Days of edgewise turned dipole magnetic equator of the Sun are given for the declining phase of the current solar cycle. At mid-latitudes the negative ionosphere disturbances are enhanced at equinoxes while positive disturbances are greater at winter; both types are prevailing at night and dawn. The ionospheric disturbance is minimum during the solar maximum at mid-latitudes but this effect vanishs towards the geomagnetic equator.

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