Optical, EUV, and Microwave Observations of the March 22, 2000 X-class Flare.

Details Optical, EUV, and Microwave Observations of the March 22, 2000 X-class Flare. Optical, EUV, and Microwave Observations of the March 22, 2000 X-class Flare.

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp42a08g&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP42A-08

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7519 Flares, 7534 Radio Emissions, 7549 Ultraviolet Emissions

Scientific paper

The evolution of an X-class flare which occured in NOAA 8910 on March 22, 2000 is discussed using observations from the Owens Valley Solar Array (ovsa), Big Bear Solar Observatory (bbso), the Transition Region and Coronal Explorer (trace), and the Michelson Doppler Imager (mdi). The main energy release occurs in a set of coronal loops visible in the trace 171 Å (1 x 106~K) wavelength band, which is rapidly followed by the emergence of two bright Hα ribbons. High-cadence radio images at around 5 GHz obtained using the ovsa appears in the middle of two Hα ribbons, which thus indicates presence of energetic electrons flowing across the two ribbons. During the impulsive phase, short-lived (τ <= 30 s), narrow-band (BW <= 500 MHz), and highly polarized microwave emission is observed in radio images in the 1-2 GHz frequency range, which is possibly due to plasma radiation. At optically-thin, high frequencies ovsa total power spectra also show a typical soft-hard-soft evolution indicative of highly efficient nonthermal electron acceleration during the impulsive phase. The microwave emission from this flare is surprisingly short considering that active region is large (> 200 arc sec in diameter) and the flare is energetic (GOES X class). We consider that the compact magnetic field geometry in the flaring region and subsequent strong chromospheric evaporation into it may have limited life of high energy electrons trapped in the loops to such a short duration.

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