Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0250l&link_type=abstract
American Astronomical Society, SPD Meeting #31, #02.50; Bulletin of the American Astronomical Society, Vol. 32, p.820
Other
Scientific paper
A powerful flare (GOES SX class of M9.8) occurred on 1999 August 20 at 23:06 UT near the eastern limb during a Max Millennium campaign. The Owens Valley Solar Array (OVSA) at the time was operating in a high time resolution (1 s) mode to observe an impulsive microwave burst rising very rapidly (within 3 s) at all observing frequencies in the range of 1.4 to 18 GHz. As a main characteristic of the burst, the microwave spectrum decays in a remarkably well-defined exponential profile with a timescale varying in the range of ~ 30 s to ~ 4 min, in proportion to the wavelength. The accompanying hard X ray emission from the BATSE DISCLA data is confined to a short time interval ( ~ 30 s), and its light curve is very similar to that of the high-frequency (15--18 GHz) microwaves. Our analysis is therefore focused on whether these observartions are consistent with theoretical predictions for the microwave emission from trapped electrons in the corona and thick target X-ray emission from the electrons precipitating into the chromosphere. In addition, we infer the magnetic reconnection geometry from EUV images obtained from SoHO/EIT which is used as another constraint to study the property of the acceleration. The OVSA is supported by NSF grants ATM-9796213 and AST-9796238 and NASA grant NAG5-6381 to New Jersey Institute of Technology.
Gallagher Peter. T.
Gary Dale E.
Lee Julian
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