Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 31, 805-816, 2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Regular paper
06 May 2013
GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm
P. Prikryl1, R. Ghoddousi-Fard2, B. S. R. Kunduri3, E. G. Thomas3, A. J. Coster4, P. T. Jayachandran5, E. Spanswick6, and D. W. Danskin7 1Communications Research Centre, Ottawa, ON, Canada
2Geodetic Survey Division, Natural Resources Canada, Ottawa, ON, Canada
3Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, USA
4Haystack Observatory, Massachusetts Institute of Technology, Westford, MA, USA
5Physics Dept, University of New Brunswick, Fredericton, NB, Canada
6Department of Physics and Astronomy, University of Calgary, AB, Canada
7Geomagnetic Laboratory, Natural Resources Canada, Ottawa, ON, Canada
Abstract. 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.

Citation: Prikryl, P., Ghoddousi-Fard, R., Kunduri, B. S. R., Thomas, E. G., Coster, A. J., Jayachandran, P. T., Spanswick, E., and Danskin, D. W.: GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm, Ann. Geophys., 31, 805-816, doi:10.5194/angeo-31-805-2013, 2013.
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