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| Titel |
GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison |
| VerfasserIn |
P. Prikryl, R. Ghoddousi-Fard, L. Spogli, C. N. Mitchell, G. Li, B. Ning, P. J. Cilliers, V. Sreeja, M. Aquino, M. Terkildsen, P. T. Jayachandran, Y. Jiao, Y. T. Morton, J. M. Ruohoniemi, E. G. Thomas, Y. Zhang, A. T. Weatherwax, L. Alfonsi, G. De Franceschi, V. Romano |
| 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. 6 ; Nr. 33, no. 6 (2015-06-02), S.657-670 |
| Datensatznummer |
250121204
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| Publikation (Nr.) |
 copernicus.org/angeo-33-657-2015.pdf |
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| Zusammenfassung |
| During the ascending phase of solar cycle 24, a series of interplanetary
coronal mass ejections (ICMEs) in the period 7–17 March 2012 caused
geomagnetic storms that strongly affected high-latitude ionosphere in the
Northern and Southern Hemisphere. GPS phase scintillation was observed at
northern and southern high latitudes by arrays of GPS ionospheric
scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers
sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic
local time (MLT), the scintillation was observed in the ionospheric cusp, the
tongue of ionization fragmented into patches, sun-aligned arcs in the polar
cap, and nightside auroral oval and subauroral latitudes. Complementing a
companion paper (Prikryl et al., 2015a) that focuses on
the high-latitude ionospheric response to variable solar wind in the North
American sector, interhemispheric comparison reveals commonalities as well as
differences and asymmetries between the northern and southern high latitudes,
as a consequence of the coupling between the solar wind and magnetosphere.
The interhemispheric asymmetries are caused by the dawn–dusk component of the
interplanetary magnetic field controlling the MLT of the cusp entry of the
storm-enhanced density plasma into the polar cap and the orientation relative
to the noon–midnight meridian of the tongue of ionization. |
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