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| Titel |
GPS TEC, scintillation and cycle slips observed at high latitudes during solar minimum |
| VerfasserIn |
P. Prikryl, P. T. Jayachandran, S. C. Mushini, D. Pokhotelov, J. W. MacDougall, E. Donovan, E. Spanswick, J.-P. St.-Maurice |
| 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 ; 28, no. 6 ; Nr. 28, no. 6 (2010-06-21), S.1307-1316 |
| Datensatznummer |
250016846
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1307-2010.pdf |
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| Zusammenfassung |
| High-latitude irregularities can impair the operation of GPS-based devices
by causing fluctuations of GPS signal amplitude and phase, also known as
scintillation. Severe scintillation events lead to losses of phase lock,
which result in cycle slips. We have used data from the Canadian High Arctic
Ionospheric Network (CHAIN) to measure amplitude and phase scintillation
from L1 GPS signals and total electron content (TEC) from L1 and L2 GPS
signals to study the relative role that various high-latitude irregularity
generation mechanisms have in producing scintillation. In the first year of
operation during the current solar minimum the amplitude scintillation has
remained very low but events of strong phase scintillation have been
observed. We have found, as expected, that auroral arc and substorm
intensifications as well as cusp region dynamics are strong sources of phase
scintillation and potential cycle slips. In addition, we have found clear
seasonal and universal time dependencies of TEC and phase scintillation over
the polar cap region. A comparison with radio instruments from the Canadian
GeoSpace Monitoring (CGSM) network strongly suggests that the polar cap
scintillation and TEC variations are associated with polar cap patches which
we therefore infer to be main contributors to scintillation-causing
irregularities in the polar cap. |
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