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Earth Science Sector Characterization of high latitude GPS sensed ionospheric irregularities: Case studies Reza Ghoddousi-Fard¹, Paul Prikryl², Kjellmar.

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Presentation on theme: "Earth Science Sector Characterization of high latitude GPS sensed ionospheric irregularities: Case studies Reza Ghoddousi-Fard¹, Paul Prikryl², Kjellmar."— Presentation transcript:

1 Earth Science Sector Characterization of high latitude GPS sensed ionospheric irregularities: Case studies Reza Ghoddousi-Fard¹, Paul Prikryl², Kjellmar Oksavik 3,4, C. van der Meeren 3, François Lahaye¹, and Donald Danskin² ¹ Canadian Geodetic Survey, Natural Resources Canada, Ottawa, Canada ² Geomagnetic Laboratory, Natural Resources Canada, Ottawa, Canada 3 Birkeland Centre for Space Science, Dept. of Physics and Technology, University of Bergen, Norway, 4 Arctic Geophysics, The University Centre in Svalbard, Norway Reza.Ghoddousi-Fard@NRCan.gc.ca 1/9

2 Earth Science Sector Less affected by noise and multipath. Better correlated with phase scintillation index. A schematic near-real-time ionospheric irregularity and data coverage representation system: regional (left), global (right): Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 2/9

3 Earth Science Sector High latitude 1Hz GPS RTIGS receivers CHAIN GPS scintillation receivers Svalbard GNSS scintillation receivers Scintillation receivers complemented by 1Hz geodetic receivers. Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 3/9

4 Earth Science Sector GPS phase ionospheric irregularities over auroral zone: Primarily a night time phenomena DoY 187 (Jul 6): Highest daily mean AE in 2013 16-17 UT, DoY 76 (Mar 17): Highest hourly AE in 2013 Year 2013 GPS phase rate statistics over Canadian auroral zone vs. AE index Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 4/9

5 Earth Science Sector Scintillation case studies: 1Hz GPS-based sDPR index responding to geomagnetic disturbances Mostly quiet! GPS phase disturbances mostly occurred near local noon and around local midnight. Correlation between large sDPR occurrences over high latitudes (gmaglat>40) with AE and solar wind speed is evident. 24 hours sDPR at IPPs from global RTIGS stations being monitored in near-real-time at CGS of NRCan. Geomagnetic storm; see next slide! Geomagnetic storm. See: Ghoddousi-Fard et al., 2013b Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 5/9

6 Earth Science Sector Hourly sDPR at IPPs from 1HZ RTIGS GPS stations (geod. lat > 25) and AE index variations during Feb. 20 (DoY 51), 2014 Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 6/9

7 Earth Science Sector A look at phase scintillation index ( ) at CHAIN and Svalbard stations during Feb. 20, 2014 (DoY 51) GPS at CHAIN stations sDPR at RTIGS 1HZ GPS station in Svalbard GPS, GLONASS and Galileo at Svalbard stations at most CHAIN stations show a phase scintillations increase at ~4 UT when rapid increase of solar wind speed occurred (and AE increased by about 1000 nT). However GNSS receivers as well as sDPR at RTIGS station at Svalbard do not show significant increase until ~7 UT. One may note that at 4 UT most CHAIN stations are near local mid-night whilst Svalbard is at morning-dawn sector. Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 7/9

8 Earth Science Sector Summary and conclusions:  GPS dual frequency phase rate statistics being monitored in near-real-time at CGS of NRCan are responding to ionospheric irregularities over high latitudes and are well correlated with geomagnetic indices.  2013 dual-frequency GPS phase rate statistics over Canadian auroral zone confirms increased disturbances primarily over local midnight. However during periods of geomagnetic storms such irregularities can occur during local day-time as well. At higher latitudes phase scintillation is a frequent phenomena even without geomagnetic storms.  Proxy indices derived from geodetic 1 Hz GPS receivers complement scintillation receivers. Careful analysis of both geodetic and scintillation receivers’ background phase fluctuations resulting from instrumentation and near-field effects are crucial to avoid misleading interpretation of data. References:  Ghoddousi-Fard R., P. Prikryl, and F. Lahaye (2013a). GPS phase difference variation statistics: A comparison between phase scintillation index and proxy indices. Advances in Space Research, 52, 1397-1405, DOI: 10.1016/j.asr.2013.06.035.  Ghoddousi-Fard R., P. Prikryl, and F. Lahaye (2013b). GPS phase difference variations and phase scintillation index: A comparison. Presentation given at International Reference Ionosphere Workshop 2013, Olsztyn, Poland, 24-28 June 2013. [http://www.uwm.edu.pl/kaig/iri_workshop_2013/] Acknowledgements: Canadian High Arctic Ionospheric Network (CHAIN) and International GNSS Service (IGS) are thanked for data access. Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 8/9

9 Earth Science Sector http://space.fmi.fi/image/ Backup slide Ghoddousi-Fard et al. “Characterization of high latitude GPS sensed ionospheric irregularities: Case studies.“ 9/9

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