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| Titel |
Topside signature of medium-scale traveling ionospheric disturbances |
| VerfasserIn |
E. S. Miller, H. Kil, J. J. Makela, R. A. Heelis, E. R. Talaat, A. Gross |
| 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 ; 32, no. 8 ; Nr. 32, no. 8 (2014-08-18), S.959-965 |
| Datensatznummer |
250121094
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| Publikation (Nr.) |
 copernicus.org/angeo-32-959-2014.pdf |
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| Zusammenfassung |
| Plasma blobs, localized plasma density enhancements that occur
singularly or in periodic groups, have been observed by in situ sensors in
the lower- and middle-latitude nighttime ionosphere. Traditionally, creation
of blobs has been thought to be connected to equatorial plasma bubbles, which
are localized plasma depletions. Here, we report the association of blobs
with medium-scale traveling ionospheric disturbances (MSTIDs). On
17 January 2010, an all-sky imager on the Caribbean island of Bonaire
(geographic: 12.190° N, 68.244° W; geomagnetic
22.46° N, 7.099° E) observed a nighttime electrified
MSTID propagating to the southwest. At the time of the MSTID's transit, the
Coupled Ion-Neutral Dynamics Investigation instrument onboard the
Communication/Navigation Outage Forecasting System satellite detected a group
of blobs along the same geomagnetic flux tubes. The electron density
variations measured at the satellite altitude, indicating the blobs, are
anticorrelated with the intensity variations of the
630.0 nm dissociative recombination emission measured on the same magnetic field lines. This relationship is explained by
a modulation of the O+ profile altitude due to electric fields generated
within the MSTID. This idea is supported by in situ measurements of the
vertical ion velocity. We argue that common climatology between blobs and
MSTIDs reported in the literature, as well as this coincident observation,
suggest that blobs may be the in situ signature of MSTIDs in the topside
ionosphere. |
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