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| Titel |
GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 1: The North American sector |
| VerfasserIn |
P. Prikryl, R. Ghoddousi-Fard, E. G. Thomas, J. M. Ruohoniemi, S. G. Shepherd, P. T. Jayachandran, D. W. Danskin, E. Spanswick, Y. Zhang, Y. Jiao, Y. T. Morton |
| 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.637-656 |
| Datensatznummer |
250121203
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| Publikation (Nr.) |
 copernicus.org/angeo-33-637-2015.pdf |
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| Zusammenfassung |
| The interval of geomagnetic storms of 7–17 March 2012
was selected at the Climate and Weather of the Sun-Earth System (CAWSES) II
Workshop for group study of space weather effects during the ascending phase
of solar cycle 24 (Tsurutani et al., 2014). The high-latitude ionospheric
response to a series of storms is studied using arrays of GPS receivers, HF
radars, ionosondes, riometers, magnetometers, and auroral imagers focusing on
GPS phase scintillation. Four geomagnetic storms showed varied responses to
solar wind conditions characterized by the interplanetary magnetic field
(IMF) and solar wind dynamic pressure. As a function of magnetic latitude
and magnetic local time, regions of enhanced scintillation are identified in
the context of coupling processes between the solar wind and the
magnetosphere–ionosphere system. Large southward IMF and high solar wind
dynamic pressure resulted in the strongest scintillation in the nightside
auroral oval. Scintillation occurrence was correlated with ground magnetic
field perturbations and riometer absorption enhancements, and collocated
with mapped auroral emission. During periods of southward IMF, scintillation
was also collocated with ionospheric convection in the expanded dawn and
dusk cells, with the antisunward convection in the polar cap and with a
tongue of ionization fractured into patches. In contrast, large northward
IMF combined with a strong solar wind dynamic pressure pulse was followed by
scintillation caused by transpolar arcs in the polar cap. |
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