Loop-top gyro-synchrotron source in post-maximum phase of the August 24, 2002 flare

Details Loop-top gyro-synchrotron source in post-maximum phase of the August 24, 2002 flare Loop-top gyro-synchrotron source in post-maximum phase of the August 24, 2002 flare

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004newa....9..383k&link_type=abstract

New Astronomy, Volume 9, Issue 5, p. 383-389.

Astronomy and Astrophysics

Astronomy

7

Sun: Flares, Sun: Radio Radiation

Scientific paper

A region with a 17 GHz radio source with a decreased microwave spectral index (α~-1.3) has been recognized at the top of the flare loop in the post-maximum phase of the August 24, 2002 flare. The radio emission from this region has been interpreted as optically thin gyro-synchrotron emission. It looks that the region appeared at the top of the flare loop as a consequence of the density decrease which reduced the free-free emission component and thus revealed the gyro-synchrotron one. The plasma parameters in the loop-top radio source are estimated. Together with associated gyro-synchrotron sources at the flare loop footpoints these phenomena indicate prolonged acceleration processes in the post-maximum phase of this flare.

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