RHESSISpectroscopic Observations of the 2005 January 20 Solar Flare

Details RHESSISpectroscopic Observations of the 2005 January 20 Solar Flare RHESSISpectroscopic Observations of the 2005 January 20 Solar Flare

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.2806s&link_type=abstract

American Astronomical Society, SPD meeting #37, #28.06; Bulletin of the American Astronomical Society, Vol. 38, p.255

Astronomy and Astrophysics

Astronomy

5

Scientific paper

The 2005 January 20 solar flare produced one of the most intense ground level events (GLEs) and one of the hardest solar energetic particle events observed. The particles reached Earth 5 minutes following the initial detection of the flare in hard X-rays and gamma-rays at 06:44 UT. RHESSI observed the entire flare and detected electron bremsstrahlung; annihilation, neutron-capture and nuclear de-excitation lines; and a high-energy component consistent with that expected from production of pions and/or bremsstrahlung from a very hard spectrum of electrons. This latter component was delayed 2 min from the lower-energy emissions and exhibited a relatively flat time history after the peak, extending until sunset. This extended emission contrasts with what was observed at lower energies. Comparison of the nuclear de-excitation and neutron-capture line time profiles suggests an accelerated proton spectrum with power-law index 2.7 in the 10 - 100 MeV range. RHESSI detected an increased rate at high energies at 07:00 UT while it was near the geomagnetic equator where only charged particles with vertical magnetic rigidities >12 GV could reach the satellite, suggesting the possible detection of solar neutrons. Solar energetic particles appear to have been detected after 07:20 UT when RHESSI was at vertical magnetic cutoff rigidities < 7 GV. This work was supported by NASA Grant NNG05GP76G.

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