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| Titel |
On the origin of pre-reversal enhancement of the zonal equatorial electric field |
| VerfasserIn |
M. C. Kelley, R. R. Ilma, G. Crowley |
| 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 ; 27, no. 5 ; Nr. 27, no. 5 (2009-05-05), S.2053-2056 |
| Datensatznummer |
250016524
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2053-2009.pdf |
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| Zusammenfassung |
| In November 2004, a large and variable interplanetary electric field (IEF)
was felt in the reference frame of the Earth. This electric field penetrated
to the magnetic equator and, when the Jicamarca Radio Observatory (JRO) was
in the dusk sector, resulted in a reversal of the normal zonal component of
the field. In turn, this caused a counter-electrojet (CEJ), a westward
current rather than the usual eastward current. At the time of the normal
pre-reversal enhancement (PRE) of the eastward field, the Jicamarca
incoherent scatter radar (ISR) observed that the westward component became
even more westward. Two of the three current explanations for the PRE depend
on the neutral wind patterns. However, this unique event was such that the
neutral wind-driven dynamos could not have changed. The implication is that
the Haerendel-Eccles mechanism, which involves partial closure of the
equatorial electrojet (EEJ) after sunset, must be the dominant mechanism for
the PRE. |
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