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| Titel |
Pre-storm NmF2 enhancements at middle latitudes: delusion or reality? |
| VerfasserIn |
A. V. Mikhailov, L. Perrone |
| 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. 3 ; Nr. 27, no. 3 (2009-03-18), S.1321-1330 |
| Datensatznummer |
250016458
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1321-2009.pdf |
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| Zusammenfassung |
| A critical analysis of recent publications devoted to
the NmF2 pre-storm enhancements is performed. There are no convincing
arguments that the observed cases of NmF2 enhancements at middle and
sub-auroral latitudes bear a relation to the following magnetic storms. In
all cases considered the NmF2 pre-storm enhancements were due to previous
geomagnetic storms, moderate auroral activity or they presented
the class of positive quiet time events (Q-disturbances). Therefore, it is
possible to conclude that there is no such an effect as the pre-storm NmF2
enhancement as a phenomenon inalienably related to the following magnetic
storm. The observed nighttime NmF2 enhancements at sub-auroral latitudes may
result from plasma transfer from the plasma ring area by meridional
thermospheric wind. Enhanced plasmaspheric fluxes into the nighttime
F2-region resulted from westward substorm-associated electric fields is
another possible source of nighttime NmF2 enhancements. Daytime positive
Q-disturbances occurring under very low geomagnetic activity level may be
related to the dayside cusp activity. |
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