Interferometric observations of solar flare precursors at 10.6 GHz

Details Interferometric observations of solar flare precursors at 10.6 GHz Interferometric observations of solar flare precursors at 10.6 GHz

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cait.rept.....h&link_type=abstract

Final Report, Oct. 1980 - Jan. 1982 California Inst. of Tech., Pasadena.

Other

Signature Analysis, Solar Flares, Sudden Storm Commencements, Amplitudes, Data Processing, Data Reduction, Microwave Interferometers, Microwave Signatures, Polarization (Waves), Predictions, Signal Measurement

Scientific paper

The purpose of this study was to examine a data base of interferometric solar microwave data in order to identify, evaluate and interpret preflare microwave signatures, with reference to their possible role for the short-term prediction of solar flares. The data base used was acquired by the Owens Valley solar interferometer at 10.6 GHz between February 19, 1980 and March 31, 1981. Twenty-seven major flares which occurred between February 19 and August 31, 1980 and for which good quality interferometric data were available, were selected using optical, soft X-ray OR microwave flux criteria. These events were analysed in detail; very similar preflare signatures noted in four (15%) of the cases. Other unusual preflare behavior was noted in four additional cases. The most common signature was a step-like increase in signal amplitude, accompanied by a decrease or reversal in the degree of polarization. Physically, this precursive signature may be identified with the onset phase of solar flares, when slow heating in the metastable magnetic loops destabilize the system, leading to rapid energy release in the impulsive phase. The reason for the distinctive polarization signature is not understood at present, but may be related to the site of the heating within the magnetic loops.

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