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TitleGPS phase scintillation at high latitudes during geomagnetic storms of 7-17 March 2012 - Part 1: The North American sector
AuthorPrikryl, P; Ghoddousi-Fard, R; Thomas, E G; Ruohoniemi, J M; Sheperd, S G; Jayachandran, P T; Danskin, D W; Spanswick, E; Zhang, Y; Jiao, Y; Morton, Y T
SourceAnnales Geophysicae vol. 33, 2015 p. 637-656, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20140371
PublisherCopernicus GmbH
Mediapaper; digital; on-line
RelatedThis publication is related to GPS phase scintillation at high latitudes during geomagnetic storms of 7-17 March 2012 - Part 2: Interhemispheric comparison
File formatpdf
Subjectsextraterrestrial geology; Health and Safety; geomagnetism; geomagnetic fields; geomagnetic variations; scintillometer surveys
Illustrationslocation maps; images; plots
ProgramPublic Safety Geoscience Northern Canada Geohazards Project
Released2015 06 02
AbstractThe interval of geomagnetic storms of 7-17 March 2012 was selected at the Climate and Weather of the Sun-Earth System (CAWSES) II Workshop for group study of space weather effects during the ascending phase of Solar Cycle 24 (Tsurutani et al., 2013). High-latitude ionospheric response to a series of storms is studied using arrays of GPS receivers, HF radars, ionosondes, riometers, magnetometers and auroral imagers. Focusing on GPS phase scintillation, the standard deviation of detrended phase, sF, is computed for L1 signal recorded at the rate of 50 Hz by GPS Ionospheric Scintillation and Total electron content (TEC) Monitors (GISTM) of the Canadian High Arctic Ionospheric Network (CHAIN) augmented by GISTMs in Gakona, Alaska. To further extend the geographic coverage, phase scintillation proxy index is obtained from geodetic-quality GPS data sampled at 1 Hz. Ionospheric regions of enhanced scintillation are identified in the context of coupling processes between solar wind and magnetosphere-ionosphere system. As a function of magnetic latitude and magnetic local time, GPS phase scintillation primarily occurs on the dayside in the ionospheric cusp/cleft, the nightside auroral oval, and the polar cap. Scintillation occurrence is correlated with ground magnetic field perturbations and riometer absorption enhancements, and coincident with mapped auroral emissions, including transpolar arcs. On a large scale, ionospheric pierce points of enhanced scintillation are collocated with intense ionospheric convection and with a tongue of ionization (TOI) that is structured into polar patches observed in TEC maps and by ionosondes. Cases of enhanced scintillation in the nightside auroral zone that was preceded by polar cap flow intensifications are observed. During intense geomagnetic storms, the phase scintillation maps to subauroral latitudes at the poleward edge of the main trough where subauroral polarization streams occur.
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. High-latitude ionospheric response to geomagnetic storms is studied.

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