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| Titel |
Midday reversal of equatorial ionospheric electric field |
| VerfasserIn |
R. G. Rastogi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 10 ; Nr. 15, no. 10, S.1309-1315 |
| Datensatznummer |
250012977
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1309-1997.pdf |
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| Zusammenfassung |
| A comparative study of the geomagnetic and
ionospheric data at equatorial and low-latitude stations in India over the 20
year period 1956–1975 is described. The reversal of the electric field in the
ionosphere over the magnetic equator during the midday hours indicated by the
disappearance of the equatorial sporadic E region echoes on the ionograms is a
rare phenomenon occurring on about 1% of time. Most of these events are
associated with geomagnetically active periods. By comparing the simultaneous
geomagnetic H field at Kodaikanal and at Alibag during the geomagnetic
storms it is shown that ring current decreases are observed at both stations.
However, an additional westward electric field is superimposed in the ionosphere
during the main phase of the storm which can be strong enough to temporarily
reverse the normally eastward electric field in the dayside ionosphere. It is
suggested that these electric fields associated with the V×Bz
electric fields originate at the magnetopause due to the interaction of the
solar wind and the interplanetary magnetic field. |
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