Observations of microwave ultra-fast absorption phenomena above solar active region.

Details Observations of microwave ultra-fast absorption phenomena above solar active region. Observations of microwave ultra-fast absorption phenomena above solar active region.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pyuno....s.427c&link_type=abstract

Publications of the Yunnan Observatory, Suppl. 1999, p. 427 - 431

Physics

Solar Microwave Radiation: Solar Active Regions

Scientific paper

While the authors process observational data of the flares 22, two rare phenomena of microwave ultra-fast absorption (MUFA) are found. They occurred at 3.67 GHz and 4.00 GHz in the atmospheric layers above both active regions of NOAA/USAF 4808 and 5060 in the interval 05h50m17s - 05h50m25sUT on May 19, 1987 and 07h38m50s - 07h38m58sUT on June 29, 1988, respectively. These absorption phenomena were observed with Phoenix II Microwave Spectrometer at three frequencies (1.42, 2.84 and 3.67 GHz) and (1.42, 2.84 and 4.00 GHz) at Yunnan Observatory. Spike emissions appeared at both 2.84 GHz and 1.42 GHz. The notable observational characteristics of both absorption phenomena are given. A possible absorption mechanism of MUFA is discussed.

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