Convection Responses to the CME Shock Fronts of 21 January 2005

Details Convection Responses to the CME Shock Fronts of 21 January 2005 Convection Responses to the CME Shock Fronts of 21 January 2005

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1498r&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1498

Physics

2712 Electric Fields (2411), 2716 Energetic Particles: Precipitating, 2774 Radiation Belts, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The MINIS campaign provided the first opportunities for multi-point measurements of electron precipitation up to MeV energies, including simultaneous measurements at different longitudes and at near-conjugate locations. Two balloons, each carrying an X-ray spectrometer for measuring the bremsstrahlung produced as electrons precipitate into the atmosphere, were launched from Churchill, Manitoba at 0850 UT on 21 January 2005 and 0140 UT on 25 January 2005. Four balloons, each carrying an X-ray spectrometer, a Z-axis search coil magnetometer, and a 3-axis electric field instrument providing DC electric field and VLF measurements in 3 frequency bands, were launched from the South African Antarctic Station (SANAE IV). The Southern launches took place at 1400 UT on 17 January, 1309 UT on 19 January, 2115 UT on 20 January, and 0950 UT on 24 January 2005. On 20 January, there was an X 7.1 class solar flare at 0650 UT. This flare produced a halo coronal mass ejection (CME) that impacted the Earth 36 hours later. At the Earth, there were two shocks with a staircase structure in density observed by the ACE spacecraft. The delayed to Earth arrival times of these shocks were 1713 and 1844 UT. The Cluster spacecraft in the solar wind also observed the shock waves closer to the Earth. Refined arrival time estimates will be discussed. During the geomagnetic storm that this CME impact produced there were 3 MINIS balloons aloft, one in the N Hemisphere and two in the South. In the balloon data, the first shock impact appeared to produce two electric field impulses of ~30 minute duration and up to 60 mV/m amplitude corresponding to flow toward the dayside cusp. These events were accompanied or followed by bursts of MeV electron precipitation, the first of which was observed in both hemispheres. The relationship between these impulses and the variations in IMF Bz will be explored. Additionally, the resulting phase shift (~ 20 min) between peak convection times in the N Hemisphere and S Hemisphere, as measured by the SuperDARN radar and MINIS, are presented and discussed. The electric field variations detected from separated balloon platforms can provide insight into the fields that convect energetic particles to form new radiation belts.

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