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| Titel |
Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China |
| VerfasserIn |
F. Ding, W. Wan, B. Ning, B. Zhao, Q. Li, Y. Wang, L. Hu, R. Zhang, B. Xiong |
| 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 ; 31, no. 2 ; Nr. 31, no. 2 (2013-02-28), S.377-385 |
| Datensatznummer |
250018999
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| Publikation (Nr.) |
 copernicus.org/angeo-31-377-2013.pdf |
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| Zusammenfassung |
| We report here on two cases of poleward-propagating large-scale traveling
ionospheric disturbances (LSTIDs) in China during a medium-scale storm
between 27 May and 1 June 2011. The observations were conducted by making use
of the Global Positioning System network and ionosondes in China and
Southeast Asia. One northeastward-propagating LSTID occurred on the morning
of 30 May, while the other was observed during the nighttime of 1 June. Both
poleward-traveling LSTIDs occurred during the storm's recovery phase in
southern China's low-latitude region (geomagnetic latitude ~ 7.3–24° N) and experienced severe dissipation during their
propagation from south to north. Although the initial relative amplitude of
the nighttime LSTID was ~ 60% larger than that of the morning event,
the nighttime event dissipated more quickly than the morning event because of
a strong nighttime enhancement in background total electronic content (TEC)
during storm time, which led to strong ion-drag dissipation during the
evening. The poleward-propagating LSTIDs exhibit a narrower latitudinal
range, a smaller amplitude, and a slightly higher elevation compared with the
equatorward-moving LSTIDs observed in the same region. Given these features,
the poleward-propagating LSTIDs were likely excited by some local source near
southern China. Excitation of secondary LSTIDs during the dissipation of some
primary medium-scale disturbances from the lower atmosphere is a possible
mechanism. |
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