MINIS Observations of ULF Waves Before the Geomagnetic Storm of 21 January 2005

Details MINIS Observations of ULF Waves Before the Geomagnetic Storm of 21 January 2005 MINIS Observations of ULF Waves Before the Geomagnetic Storm of 21 January 2005

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43c..02b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM43C-02

Physics

[2712] Magnetospheric Physics / Electric Fields, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2752] Magnetospheric Physics / Mhd Waves And Instabilities

Scientific paper

The MINIS balloon campaign was successfully conducted in January 2005 to investigate relativistic electron loss mechanisms. The MINIS campaign provided multi-point measurements of electron precipitation up to MeV energies, including simultaneous measurements at different longitudes and hemispheres. Four balloons, each carrying an X-ray spectrometer, 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). An X 7.1 solar flare occurred at 0636 UT on 20 January 2005. A CME from this flare arrived at the Earth 34 hours later. An SSC began at ~1650 UT followed by a geomagnetic storm with a Dst perturbation of ~-100nT. The arrival of the CME initiated an interval of very strong relativistic electron precipitation. The second and third Southern payloads and the first Northern payload made observations in both hemispheres of several extensive relativistic electron precipitation events that occurred from 1700 to 2000 UT on 21 January 2005. ULF waves are thought to play a significant role in the acceleration and precipitation of these particles. The balloon payloads observed several hours of very quiet wave conditions immediately following the flare. During the last several hours before the CME arrival, the balloons observed significant increases of the broad -band electric field power spectrum in the Pc3 and Pc5 bands. Narrow band Pc3 emissions were also seen at this time. This paper will present a preliminary review of the time history and polarization properties of these emissions. The status of efforts to determine the payload motion well enough to obtain ULF wave data from the on-board magnetometer will also be discussed.

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