Ionospheric Irregularities at High Latitudes During Geomagnetic Storms and Substorms: Simultaneous Observations of Magnetic Field Perturbations and GPS Scintillations SM11B-2297 Plasma instability in the ionosphere is often observed as disturbance and distortion of the amplitude and phase of radio signals, which are known as ionospheric scintillations. High-latitude ionospheric plasma, closely connected to solar wind and magnetospheric dynamics, produce very dynamic and short-lived GPS scintillations, making it challenging to characterize them. This study reports simultaneous observations of geomagnetic pulsations and GPS signal scintillations during geomagnetic storms and substorms using a newly designed Autonomous Adaptive Low-Power Instrument Platform (AAL-PIP) installed at the South Pole. A statistical investigation of the AAL-PIP data recorded from January through May 2012 is presented to study local time distribution of scintillation events and a correlation between GPS scintillation and magnetic field perturbations. This report discusses a possible connection between magnetic field perturbations associated with the ionospheric currents and the creation of plasma instability by examining relative contribution of storm/substorm activity to ionospheric irregularities.
Hyomin Kim1, Kshitija Deshpande1, Calvin R Clauer1, Gary S Bust2, Geoffrey Crowley2, Todd E Humphreys3, Lilian Kim4, Marc Lessard5, Allan T Weatherwax6, Thomas P Zachariah7 1. ECE Dept., Virginia Tech, Blacksburg, VA, USA; 2. Atmospheric and Space Technology Research Associates, Boulder, CO, USA; 3. University of Texas at Austin, Austin, TX, USA; 4. Arizona State University, Tempe, AZ, USA; 5. University of New Hampshire, Durham, NH, USA; 6. Siena College, Loudonville, NY, USA; 7. Loyola Marymount University, Los Angeles, CA, USA