VLA-BATSE observations of an intense solar decimetric and hard X-ray burst

Details VLA-BATSE observations of an intense solar decimetric and hard X-ray burst VLA-BATSE observations of an intense solar decimetric and hard X-ray burst

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..798w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 2, p. 798-810.

Astronomy and Astrophysics

Astronomy

13

High Energy Electrons, Radio Spectra, Solar Radio Bursts, Synchrotron Radiation, X Ray Spectra, Coronal Loops, Solar Flares, Solar Spectra, X Ray Astronomy

Scientific paper

We discuss observations of a multiply impulsive solar burst that was detected simultaneously by the VLA at 20 and 90 cm and by the Burst and Transient Experiment (BATSE) at hard X-ray wavelengths. The flare-associated 20 cm emission consists of two groups of bursts about 4 min apart. Hard X-ray emission above 25 keV was detected during both groups of bursts, while 90 cm bursts occurred only during the second and more intense group. VLA snapshot maps at intervals of 1.7 s reveal that the 20 cm burst originates within a relatively compact source located above the east limb at a height of roughly 1.8 x 10 exp 10 cm. The 90 cm burst is more extended and lies at a height of roughly 2.2 x 10 exp 10 cm. The similarity of the time profiles in the two spectral domains suggests a common injection of energetic electrons, while the time delays are consistent with the travel times of electrons which propagate from the chromosphere to the sites of the coronal radio bursts. We find that the VLA emission is probably the type III or type IV radiation of electrons trapped in large coronal loops, and that plasma radiation, rather than gyrosynchrotron emission, can explain it.

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