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TitleGPS phase scintillation at high latitudes during the geomagnetic storm of March 17-18, 2015
AuthorPrikryl, P; Ghoddousi-Fard, R; Connors, M; Weygand, J M; Viljanen, A; Danskin, D W; Jayachandran, P T; Jacobsen, K S; Andalsvik, Y L; Thomas, E G; Ruohoniemi, J M; Durgonics, T; Oksavik, K; Zhang, Y; Spanswick, E; Aquino, M; Sreeja, V
SourceJournal of Geophysical Research vol. 121, 2016.,
Alt SeriesEarth Sciences Sector, Contribution Series 20160133
PublisherAmerican Geophysical Union
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; magnetic storms; storms; geomagnetism; ionosphere; magnetometers; remote sensing; auroral zone; auroras
Illustrationslocation maps; graphs; magnetic maps
ProgramNorthern Canada Geohazards Project, Public Safety Geoscience
AbstractGeomagnetic storm of March 17-18, 2015 was caused by impacts of a coronal mass ejection and a high-speed plasma stream from a coronal hole. The high-latitude ionosphere dynamics is studied using arrays of ground-based instruments including Global Navigation Satellite System (GNSS) receivers, HF radars, ionosondes, riometers and magnetometers. The phase scintillation index is computed for L1 signal sampled at the rate of up to 100 Hz by specialized GNSS scintillation receivers supplemented by the phase scintillation proxy index obtained from geodetic-quality GPS data sampled at 1 Hz. In the context of solar wind coupling to the magnetosphere-ionosphere system, it is shown that GPS phase scintillation is primarily enhanced in the cusp, tongue of ionization (TOI) broken into patches drawn into the polar cap from the dayside storm-enhanced plasma density (SED) and in the auroral oval. In particular, in this paper we examine the relation to auroral electrojet currents observed by arrays of ground-based magnetometers, and energetic particle precipitation observed by DMSP satellites. Equivalent ionospheric currents (EICs) are obtained from ground magnetometer data using the spherical elementary currents systems (SECS) technique developed by Amm and Viljanen [1999] that has been applied over the entire North American ground magnetometer network and the International Monitor for Auroral Geomagnetic Effects (IMAGE) network over the Scandinavia. The GNSS phase scintillation mapped to the poleward side of strong westward electrojet and to the edge of the eastward electrojet region. Also, the scintillation was generally collocated with fluxes of energetic electron precipitation observed by DMSP satellites with exception of a period of pulsating aurora when only very weak EICs were observed.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. This paper examines GNSS scintillation during a geomagnetic storm.