VLA, PHOENIX and BATSE observations of an X1 flare

Details VLA, PHOENIX and BATSE observations of an X1 flare VLA, PHOENIX and BATSE observations of an X1 flare

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9227935w&link_type=abstract

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Physics

Magnetic Fields, Solar Corona, Solar Flares, Solar X-Rays, Spectrometers, Sun, Very Large Array (Vla), Acceleration (Physics), Constants, Drift Rate, Electrons, Gamma Rays, Maps, Surges, Velocity

Scientific paper

We present observations of an X1 flare detected simultaneously with the Very Large Array (VLA), the PHOENIX Digital Radio Spectrometer, and the Burst and Transient Source Experiment (BATSE) aboard the Gamma Ray Observatory (GRO). The VLA was used to produce snapshot maps of the impulsive burst emission in the higher corona on timescales of 1.7 seconds at both 20 and 01 cm. Our results indicate electron acceleration several minutes before the onset of the hard X-ray burst detected by BATSE. Comparisons with high spectral and spatial observations by PHOENIX reveal a variety of radio bursts at 20 cm, such as type III bursts, intermediate drift bursts, and quasi-periodic pulsations during different stages of the X1 flare. From the drift rates of these radio bursts we derive information on local density scale heights, the speed of radio exciters, and the local magnetic field. Radio emission at 90 cm shows a type IV burst moving outward with a constant velocity of 240 km/sec. The described X1 flare is unique in the sense that it appeared at the east limb (N06/E88 providing the most accurate information on the vertical structure of different flare tracers visible in radio wavelengths.

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