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| Titel |
E-region wind-driven electrical coupling of patchy sporadic-E and spread-F at midlatitude |
| VerfasserIn |
S. Shalimov, C. Haldoupis |
| 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 ; 23, no. 6 ; Nr. 23, no. 6 (2005-09-15), S.2095-2105 |
| Datensatznummer |
250015291
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| Publikation (Nr.) |
 copernicus.org/angeo-23-2095-2005.pdf |
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| Zusammenfassung |
This paper investigates the role of neutral winds
in the generation of relatively large polarization electric fields
across patchy sporadic-E layers, which then map upward to the
F region, to create conditions for medium-scale spread-F. The
calculations are based on an analytical model that uses the
current continuity equation and field-aligned current closures to
the F region in order to describe quantitatively a Hall
polarization process inside sporadic-E plasma patches during
nighttime. In applying this model we use experimentally known
values for E and F region, conductances, the ambient electric
fields and prevailing neutral winds, in order to estimate the
polarization fields that build up inside sporadic-E. It is found
that the relatively strong west-southwest neutral winds during
summer nighttime can provide the free energy for the
generation of sizable polarization electric fields, which have
comparable eastward and north-upward components and reach values
of several mV/m. Given that the sporadic-E patches have sizes
from a few to several tens of kilometers, the polarization fields
can map easily to the F region bottomside where they impact
ExB plasma uplifts and westward bulk
motions, in line with key observational properties of medium-scale
spread-F. However, the present simple model needs further
development to also include wind forcing of the F region plasma
and possible polarization processes inside spread-F.
Keywords. Ionosphere (Electric fields and currents; Ionospheric
irregularities; Mid-latitude ionosphere) |
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