GPS TEC, scintillation and cycle slips observed at high latitudes during solar minimum

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 Io...

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Bibliographic Details
Published in:Annales Geophysicae
Main Authors: Prikryl, P., Jayachandran, P. T., Mushini, S. C., Pokhotelov, D., MacDougall, J. W., Donovan, E., Spanswick, E., St.-Maurice, J.-P.
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2010
Subjects:
article
Verlagsveröffentlichung
Arctic
Canadian High Arctic Ionospheric Network
Online Access:https://doi.org/10.5194/angeo-28-1307-2010
https://noa.gwlb.de/receive/cop_mods_00028832
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00028787/angeo-28-1307-2010.pdf
https://angeo.copernicus.org/articles/28/1307/2010/angeo-28-1307-2010.pdf
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Summary: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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