Nonthermal Radio Emission from Solar Soft X-Ray Transient Brightenings

Details Nonthermal Radio Emission from Solar Soft X-Ray Transient Brightenings Nonthermal Radio Emission from Solar Soft X-Ray Transient Brightenings

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477..958g&link_type=abstract

Astrophysical Journal v.477, p.958

Astronomy and Astrophysics

Astronomy

33

Sun: Radio Radiation, Sun: X-Rays, Gamma Rays

Scientific paper

We compare microwave total power spectral data from the Owens Valley Radio Observatory Solar Array with soft X-ray transient brightenings observed with the Yohkoh soft X-ray telescope. We find that the transient brightenings are clearly detected in microwaves in 12 of 34 events (35%), possibly detected in another 17 of 34 events (50%), and only five of 34 events (15%) had no apparent microwave counterpart. Comparing the radio and soft X-ray characteristics, we find that (1) the soft X-ray peak is delayed relative to the microwave peak in 16 of 20 events, (2) the microwave flux is correlated with the flux seen in soft X-rays, (3) when radio fluence is used instead of radio flux (24 events) the correlation increases substantially, (4) the microwave spectra in the range 1--18 GHz vary greatly from event to event, (5) the microwave spectra often peak in the range 5--10 GHz (13 of 16 events), and (6) the microwave spectra of some events show narrowband spectra with a steep low-frequency slope. We conclude that the emission from at least some events is the result of a nonthermal population of electrons, and that transient brightenings as a whole can therefore be identified as microflares, the low-energy extension of the general flare energy distribution. Soft X-ray transient brightenings, and therefore microflares, cannot heat the corona.

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