A very narrow gyrosynchrotron spectrum during a solar flare

Details A very narrow gyrosynchrotron spectrum during a solar flare A very narrow gyrosynchrotron spectrum during a solar flare

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...457..693g&link_type=abstract

Astronomy and Astrophysics, Volume 457, Issue 2, October II 2006, pp.693-697

Astronomy and Astrophysics

Astrophysics

2

Sun: Activity, Sun: Flares, Sun: Radio Radiation

Scientific paper

During the rising phase of the radio burst of August 30, 2002, at ˜ 1328 UT a short pulse with a duration of approximately 4 s was observed. Here we present a multiwavelength analysis, including microwave and X-ray. Its background-subtracted radio spectrum ranges only from 2.5 to 12 GHz with a maximum flux density of approximately 900 s.f.u. at 7 GHz and a steep optically thin spectral index α˜ 8. The hard X-ray pulse emission above the background in the range of 10-150 keV observed by RHESSI is coincident in time with the microwave observation. Hard X-ray images reveal very compact (~10'') footpoint sources. A distribution of accelerated electrons represented by a double power law, with δE < 250 ~ keV = 5.3 and δE ≥ 250 keV = 13, was used to compute the expected gyrosynchrotron and thick target bremsstrahlung fluxes of a homogeneous source. We interpret the very steep electron index above the energy break to represent a high energy cutoff. With these parameters, our results reproduce the observations well. Nevertheless, they pose the still unanswered question about the mechanism that has slectively accelerated these electrons.

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