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| Titel |
A modified index for the description of the ionospheric short- and long-term activity |
| VerfasserIn |
J. Mielich, J. Bremer |
| 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 ; 28, no. 12 ; Nr. 28, no. 12 (2010-12-21), S.2227-2236 |
| Datensatznummer |
250016926
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| Publikation (Nr.) |
 copernicus.org/angeo-28-2227-2010.pdf |
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| Zusammenfassung |
| A modified ionospheric activity index AI has been developed on the basis of
ionospheric foF2 observations. Such index can be helpful for an interested
user to get information about the current state of the ionosphere. Using
ionosonde data of the station Juliusruh (54.6° N; 13.4° E) this index
has been tested for the time interval from January 1996 until December 2008.
This index has no diurnal and seasonal variations, only a small positive
dependence on the solar activity could be found. The variability of this
index has, however, a marked seasonal variability with maxima during the
equinoxes, a clear minimum in summer, and enhanced values in winter. The
observed variability of AI is strongly correlated with the geomagnetic
activity, most markedly during the equinoxes, whereas the influence of the
solar activity is markedly smaller and mostly insignificant. Strong
geomagnetic disturbances cause in middle latitudes in general negative
disturbances in AI, mostly pronounced during equinoxes and summer and only
partly during winter, thus in agreement with the current physical knowledge
about ionospheric storms. |
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