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| Titel |
Direct observations of blob deformation during a substorm |
| VerfasserIn |
T. Ishida, Y. Ogawa, A. Kadokura, K. Hosokawa, Y. Otsuka |
| 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 ; 33, no. 5 ; Nr. 33, no. 5 (2015-05-06), S.525-530 |
| Datensatznummer |
250121194
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| Publikation (Nr.) |
 copernicus.org/angeo-33-525-2015.pdf |
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| Zusammenfassung |
| Ionospheric blobs are localized plasma density enhancements, which are
mainly produced by the transportation process of plasma. To understand the
deformation process of a blob, observations of plasma parameters with good
spatial–temporal resolution are desirable. Thus, we conducted the European
Incoherent Scatter radar observations with high-speed meridional scans
(60–80 s) during October and December 2013, and observed the temporal
evolution of a blob during a substorm on 4 December 2013. This paper is the
first report of direct observations of blob deformation during a substorm.
The blob deformation arose from an enhanced plasma flow shear during the
substorm expansion phase, and then the blob split into two smaller-scale
blobs, whose scale sizes were more than ~100 km in latitude.
Our analysis indicates that the Kelvin–Helmholtz instability and
dissociative recombination could have deformed the blob structure. |
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