Magnetospheric electric field variations caused by storm-time shock fronts
Abstract
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 sim 0650 UT This flare produced a halo coronal mass ejection CME that impacted the Earth sim 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 each shock impact appeared to produce an intense electric field
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36.2181R