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| Titel |
Global propagation features of large-scale traveling ionospheric disturbances during the magnetic storm of 7~10 November 2004 |
| VerfasserIn |
Q. Song, F. Ding, W. Wan, B. Ning, L. Liu |
| 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 ; 30, no. 4 ; Nr. 30, no. 4 (2012-04-17), S.683-694 |
| Datensatznummer |
250017212
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| Publikation (Nr.) |
 copernicus.org/angeo-30-683-2012.pdf |
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| Zusammenfassung |
| Larger-scale traveling ionospheric disturbances (LSTIDs)
were studied using the total electron content (TEC) data observed from
global GPS network in the regions of North America, Europe, and East Asia
during the magnetic storm of 7~10 November 2004. 4 LSTID events were
detected in North America, 4 in Europe, and 3 in East Asia. The parameters
of the 11 LSTID events, such as the propagation azimuth (the angle with
respect to north, taking clockwise as positive), horizontal phase velocity
and damping rate were determined. Our results showed two new propagation
features of the LSTIDs. One was the latitudinal dependence of the LSTIDs'
propagation azimuths. The LSTIDs tended to deflect more to west from south
as they propagated to lower latitudes, which indicated that the Coriolis
force was one of the main causes of the LSTIDs' southwestward deviation. The
other was the different mean horizontal phase velocities of LSTIDs among
different regions. The mean horizontal phase velocity of LSTIDs was 422 ± 36 m s−1
in North America, 381 ± 69 m s−1 in Europe, and 527 ± 21 m s−1 in
East Asia, respectively. The results also indicated that the amplitudes of
LSTIDs decreased during their propagation for every event, and the daytime
damping rates were more than 1 time larger than the nighttime ones due to
different ion drag between daytime and nighttime. The source regions of the
LSTIDs were likely to be located between geomagnetic latitudes of 68° N
and 62° N in North America, and between 65° N and 57° N in Europe,
according to the variation of magnetic H component observed in these two
regions. |
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