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TitleGPS phase scintillation at high latitudes during two geomagnetic storms
AuthorPrikryl, P; Ghoddousi-Fard, R; Ruohoniemi, J M; Thomas, E G
SourceAuroral dynamics and space weather; by Zhang, Y (ed.); Paxton, L J (ed.); 2016 p. 211-232
Alt SeriesEarth Sciences Sector, Contribution Series 20140346
PublisherAmerican Geophysical Union
Mediapaper; digital
Subjectsgeophysics; auroras
ProgramNorthern Canada Geohazards Project, Public Safety Geoscience
LinksOrder online - Commander en ligne
AbstractIntense GPS phase scintillation was observed during two geomagnetic storms that were caused by impacts of coronal mass ejections on November 1, 2011 and March 17, 2013. Ionospheric regions of enhanced scintillation are identified in the context of coupling between solar wind and magnetosphere-ionosphere system. Scintillation was collocated with an expanded auroral oval and with a tongue of ionization (TOI) drawn through the cusp into the polar cap from the dayside storm-enhanced plasma density (SED). Intense scintillation was collocated with regions of fast drifting decameter F-region irregularities particularly in the cusp and dayside polar cap and with strong return convection in the post-midnight auroral oval. Weak scintillation mapped to the poleward edge of main trough and subauroral polarization stream (SAPS). The scintillation occurrence magnetic local time of these regions was controlled by the IMF BY. A link between scintillation occurrence collocated with TOI and the nightside auroral oval, which is consistent with recently discovered relationships between polar cap patches and substorms [Nishimura et al., 2013] and between enhanced polar cap flows and poleward boundary intensifications [Zou at al., 2014], is suggested.
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 the occurrence of GPS phase scintilaltion at high latitudes during geomagnetic storms caused by major solar wind disturbances. This provides information to guide the design of space weather hazard forecasting.