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| Titel |
GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| VerfasserIn |
P. Prikryl, R. Ghoddousi-Fard, B. S. R. Kunduri, E. G. Thomas, A. J. Coster, P. T. Jayachandran, E. Spanswick, D. W. Danskin |
| 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 ; 31, no. 5 ; Nr. 31, no. 5 (2013-05-06), S.805-816 |
| Datensatznummer |
250019035
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| Publikation (Nr.) |
 copernicus.org/angeo-31-805-2013.pdf |
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| Zusammenfassung |
| The amplitude and phase scintillation indices are customarily obtained by
specialised GPS Ionospheric Scintillation and TEC Monitors (GISTMs) from L1
signal recorded at the rate of 50 Hz. The scintillation indices S4 and
σΦ are stored in real time from an array of high-rate
scintillation receivers of the Canadian High Arctic Ionospheric Network
(CHAIN). Ionospheric phase scintillation was observed at high latitudes
during a moderate geomagnetic storm (Dst = −61 nT) that was caused by a
moderate solar wind plasma stream compounded with the impact of two coronal
mass ejections. The most intense phase scintillation (σΦ
~ 1 rad) occurred in the cusp and the polar cap where it was
co-located with a strong ionospheric convection, an extended tongue of
ionisation and dense polar cap patches that were observed with ionosondes
and HF radars. At sub-auroral latitudes, a sub-auroral polarisation stream
that was observed by mid-latitude radars was associated with weak
scintillation (defined arbitrarily as σΦ < 0.5 rad).
In the auroral zone, moderate scintillation coincided with auroral
breakups observed by an all-sky imager, a riometer and a magnetometer in
Yellowknife. To overcome the limited geographic coverage by GISTMs other
GNSS data sampled at 1 Hz can be used to obtain scintillation proxy indices.
In this study, a phase scintillation proxy index (delta phase rate, DPR) is
obtained from 1-Hz data from CHAIN and other GPS receivers. The 50-Hz and
1-Hz phase scintillation indices are correlated. The percentage occurrences
of σΦ > 0.1 rad and DPR > 2 mm s−1, both
mapped as a function of magnetic latitude and magnetic local time, are very
similar. |
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