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| Titel |
Simultaneous observations of large-scale traveling ionospheric disturbances on the nightside and dayside middle latitude |
| VerfasserIn |
H. T. Cai, F. Yin, S. Y. Ma, J. S. Xu, Y. W. 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. 12 ; Nr. 30, no. 12 (2012-12-19), S.1709-1717 |
| Datensatznummer |
250017297
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1709-2012.pdf |
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| Zusammenfassung |
| In this paper, we present further observational evidence for the
transpolar propagation of large-scale traveling ionospheric disturbances
(LSTIDs) from their nightside source region to the dayside reported by Cai
et al. (2011). Slant total electron content (STEC) observed by
longitudinally aligned GPS receiver chains in North American and European
sectors was analyzed to demonstrate presences of LSTIDs at both nightside
and dayside mid-latitude. Signatures of TID were inferred from phase
difference in time series of STEC perturbations (TECP) derived from
measurements of ground-based GPS receivers, which are separated by hundreds
of kilometers longitudinally. Periods of the daytime and nighttime ionospheric
disturbances were estimated to be around 128 min, being in good
agreement with that of the transpolar AGW (atmospheric gravity
wave) recorded by EISCAT (European Incoherent Scatter Scientific Association)/ESR (EISCAT Svalbard Radar) radars. On
the dayside, the LSTID moved equatorward with an average phase speed of
~440 m s−1. In North American sector, however, southward speed
of the nighttime LSTID was much slower, being around 160 m s−1. We suggest
that the observed daytime and nighttime mid-latitude LSTIDs are likely to
have the same source region, being located somewhere at nighttime auroral
latitude. Having been launched on the nightside, the waves propagate
simultaneously equatorward and poleward. The equatorward-moving waves are
recorded by GPS receiver chain in North American sector. The poleward-moving
waves, however, cross the polar cap from nightside to dayside and then are
detected consecutively at high and mid-latitudes by EISCAT/ESR radars and
GPS receiver chains, respectively. |
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