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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 33, issue 6
Ann. Geophys., 33, 657-670, 2015
https://doi.org/10.5194/angeo-33-657-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 33, 657-670, 2015
https://doi.org/10.5194/angeo-33-657-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 02 Jun 2015

Regular paper | 02 Jun 2015

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison

P. Prikryl1,9, R. Ghoddousi-Fard2, L. Spogli3, C. N. Mitchell4, G. Li5, B. Ning5, P. J. Cilliers6, V. Sreeja7, M. Aquino7, M. Terkildsen8, P. T. Jayachandran9, Y. Jiao10, Y. T. Morton10, J. M. Ruohoniemi11, E. G. Thomas11, Y. Zhang12, A. T. Weatherwax13, L. Alfonsi3, G. De Franceschi3, and V. Romano3 P. Prikryl et al.
  • 1Geomagnetic Laboratory, Natural Resources Canada, Ottawa, ON, Canada
  • 2Canadian Geodetic Survey, Natural Resources Canada, Ottawa, ON, Canada
  • 3Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
  • 4Department of Electronic and Electrical Engineering, University of Bath, Bath, UK
  • 5Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
  • 6Space Science Directorate, South African National Space Agency, Hermanus, South Africa
  • 7Nottingham Geospatial Institute, University of Nottingham, Nottingham, UK
  • 8IPS Radio and Space Services, Bureau of Meteorology, Haymarket, NSW, Australia
  • 9Physics Department, University of New Brunswick, Fredericton, NB, Canada
  • 10Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO, USA
  • 11Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, USA
  • 12Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
  • 13Department of Physics and Astronomy, Siena College, Loudonville, NY, USA

Abstract. During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7–17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time (MLT), the scintillation was observed in the ionospheric cusp, the tongue of ionization fragmented into patches, sun-aligned arcs in the polar cap, and nightside auroral oval and subauroral latitudes. Complementing a companion paper (Prikryl et al., 2015a) that focuses on the high-latitude ionospheric response to variable solar wind in the North American sector, interhemispheric comparison reveals commonalities as well as differences and asymmetries between the northern and southern high latitudes, as a consequence of the coupling between the solar wind and magnetosphere. The interhemispheric asymmetries are caused by the dawn–dusk component of the interplanetary magnetic field controlling the MLT of the cusp entry of the storm-enhanced density plasma into the polar cap and the orientation relative to the noon–midnight meridian of the tongue of ionization.

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A series of interplanetary coronal mass ejections in the period 7–17 March 2012 caused geomagnetic storms that strongly affected the high-latitude ionosphere in the Northern and Southern Hemisphere. Interhemispheric comparison of GPS phase scintillation reveals commonalities as well as asymmetries, as a consequence of the coupling between the solar wind and magnetosphere. The interhemispheric asymmetries are primarily caused by the dawn-dusk component of the interplanetary magnetic field.
A series of interplanetary coronal mass ejections in the period 7–17 March 2012 caused...
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