GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm
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 <I>S</I><sub>4</sub> and σ<sub>Φ<...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2013-05-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/31/805/2013/angeo-31-805-2013.pdf |
| _version_ | 1818939982615674880 |
|---|---|
| author | P. Prikryl R. Ghoddousi-Fard B. S. R. Kunduri E. G. Thomas A. J. Coster P. T. Jayachandran E. Spanswick D. W. Danskin |
| author_facet | P. Prikryl R. Ghoddousi-Fard B. S. R. Kunduri E. G. Thomas A. J. Coster P. T. Jayachandran E. Spanswick D. W. Danskin |
| author_sort | P. Prikryl |
| collection | DOAJ |
| description | 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 <I>S</I><sub>4</sub> and
σ<sub>Φ</sub> 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 (σ<sub>Φ</sub>
~ 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 σ<sub>Φ</sub> < 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 σ<sub>Φ</sub> > 0.1 rad and DPR > 2 mm s<sup>−1</sup>, both
mapped as a function of magnetic latitude and magnetic local time, are very
similar. |
| first_indexed | 2024-12-20T06:32:24Z |
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| id | doaj.art-2ea962c680c1495c9db3d1c7a37a08d5 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-20T06:32:24Z |
| publishDate | 2013-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-2ea962c680c1495c9db3d1c7a37a08d52022-12-21T19:50:05ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762013-05-013180581610.5194/angeo-31-805-2013GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic stormP. Prikryl0R. Ghoddousi-Fard1B. S. R. Kunduri2E. G. Thomas3A. J. Coster4P. T. Jayachandran5E. Spanswick6D. W. Danskin7Communications Research Centre, Ottawa, ON, CanadaGeodetic Survey Division, Natural Resources Canada, Ottawa, ON, CanadaBradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, USABradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, USAHaystack Observatory, Massachusetts Institute of Technology, Westford, MA, USAPhysics Dept, University of New Brunswick, Fredericton, NB, CanadaDepartment of Physics and Astronomy, University of Calgary, AB, CanadaGeomagnetic Laboratory, Natural Resources Canada, Ottawa, ON, CanadaThe 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 <I>S</I><sub>4</sub> and σ<sub>Φ</sub> 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 (σ<sub>Φ</sub> ~ 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 σ<sub>Φ</sub> < 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 σ<sub>Φ</sub> > 0.1 rad and DPR > 2 mm s<sup>−1</sup>, both mapped as a function of magnetic latitude and magnetic local time, are very similar.https://www.ann-geophys.net/31/805/2013/angeo-31-805-2013.pdf |
| spellingShingle | P. Prikryl R. Ghoddousi-Fard B. S. R. Kunduri E. G. Thomas A. J. Coster P. T. Jayachandran E. Spanswick D. W. Danskin GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm Annales Geophysicae |
| title | GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| title_full | GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| title_fullStr | GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| title_full_unstemmed | GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| title_short | GPS phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| title_sort | gps phase scintillation and proxy index at high latitudes during a moderate geomagnetic storm |
| url | https://www.ann-geophys.net/31/805/2013/angeo-31-805-2013.pdf |
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