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| Titel |
Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill |
| VerfasserIn |
A. V. Pavlov, M. J. Buonsanto |
| 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 ; 16, no. 4 ; Nr. 16, no. 4, S.460-469 |
| Datensatznummer |
250013247
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| Publikation (Nr.) |
 copernicus.org/angeo-16-460-1998.pdf |
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| Zusammenfassung |
This study compares the observed behavior of
the F region ionosphere over Millstone Hill with calculations from the
IZMIRAN model for solar minimum for the geomagnetically quiet period 23-25 June
1986, when anomalously low values of hmF2(<200 km) were observed. We
found that these low values of hmF2 (seen as a G condition on ionograms)
exist in the ionosphere due to a decrease of production rates of oxygen ions
resulting from low values of atomic oxygen density. Results show that
determination of a G condition using incoherent scatter radar data is sensitive
both to the true concentration of O+ relative to the molecular ions,
and to the ion composition model assumed in the data reduction process. The
increase in the O++ N 2 loss rate due to vibrationally
excited N2 produces a reduction in NmF2 of typically 5-10% ,
but as large as 15% , bringing the model and data into better agreement. The
effect of vibrationally excited NO+ ions on electron densities is
negligible.
Key words. Ionosphere (Ion chemistry and composition;
Ionosphere-atmosphere interactions; Mid-latitude ionosphere). |
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