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| Titel |
The Southern Hemisphere and equatorial region ionization response for a 22 September 1999 severe magnetic storm |
| VerfasserIn |
E. Yizengaw, E. A. Essex, R. Birsa |
| 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 ; 22, no. 8 ; Nr. 22, no. 8 (2004-09-07), S.2765-2773 |
| Datensatznummer |
250014963
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2765-2004.pdf |
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| Zusammenfassung |
| The ionospheric storm evolution process was monitored during the 22 September
1999 magnetic storm over the Australian eastern region, through measurements
of the ionospheric Total Electron Content (TEC) from seven Global Positioning
Systems (GPS) stations. The spatial and temporal variations of the ionosphere
were analysed as a time series of TEC maps. Results of our analysis show that
the main ionospheric effect of the storm under consideration are: the long
lasting negative storm effect during a magnetic storm at mid-latitude regions;
the strong, positive disturbances during the storm's main phase at auroral latitude
regions; the effects of storm-induced equatorward directed wind causing a
positive disturbance at high and mid-latitude stations with appropriate time
shift between higher and lower latitudes; daytime poleward movement of
depleted plasma that causes temporary suppression of the equatorial anomaly
during the start of the storm recovery phase; and prompt penetration of eastward
electric fields to ionospheric altitudes and the production of nearly
simultaneous TEC enhancement at all latitudes. In general, we found dominant
negative disturbance over mid and high latitudes and positive disturbance at
low latitudes. A comparison of storm-time behaviour of TEC determined from
GPS satellites, and foF2 derived from ionosondes at a range of
latitudes, showed reasonable agreement between the two independent
measurements. |
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