1Communications Research Centre, Ottawa, ON, Canada
2Physics Department, University of New Brunswick, Fredericton, NB, Canada
3University of Western Ontario, London, ON, Canada
4Dept. of Physics and Astronomy, University of Calgary, AB, Canada
5University of Saskatchewan, Saskatoon, SK, Canada
Received: 16 Mar 2010 – Revised: 27 May 2010 – Accepted: 01 Jun 2010 – Published: 21 Jun 2010
Abstract. 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.
Prikryl, P., Jayachandran, P. T., Mushini, S. C., Pokhotelov, D., MacDougall, J. W., Donovan, E., Spanswick, E., and St.-Maurice, J.-P.: GPS TEC, scintillation and cycle slips observed at high latitudes during solar minimum, Ann. Geophys., 28, 1307-1316, doi:10.5194/angeo-28-1307-2010, 2010.