The Radio Signature of Magnetic Reconnection for the M-Class Flare of 2004 November 1

Details The Radio Signature of Magnetic Reconnection for the M-Class Flare of 2004 November 1 The Radio Signature of Magnetic Reconnection for the M-Class Flare of 2004 November 1

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...672l.131h&link_type=abstract

The Astrophysical Journal, Volume 672, Issue 2, pp. L131-L134.

Astronomy and Astrophysics

Astronomy

5

Sun: Flares, Sun: Magnetic Fields, Sun: Particle Emission

Scientific paper

In this Letter, we present radio diagnostics for the magnetic field and the density distribution of nonthermal electrons in the microwave source of the M1.1 flare of 2004 November 1. We calculate the nonthermal gyrosynchrotron radiation using observations made at the Nobeyama Radio Observatory to get the longitudinal magnetic field and the magnitude of the transverse magnetic field. The computed longitudinal magnetic field at two hard X-ray footpoints has opposite polarities, which basically agrees with SOHO MDI observations. The main finding is that the magnitude of the transverse magnetic field summed around the magnetic neutral line of the SOHO MDI magnetogram has a short-term impulsive increase during the rising phase of the flare. We propose that the increase of the transverse magnetic field may be considered evidence of the magnetic reconnection process in this flare. The computed mean angle between the magnetic field and line of sight decreases steadily during the flare, clearly indicating the reconfiguration of the magnetic field, presumably the relaxation of the sheared magnetic field. Moreover, the calculated density of nonthermal electrons increases from footpoints to looptop, while the spectral index calculated by the Nobeyama Radio Heliograph at 17 and 34 GHz decreases from footpoints (soft) to looptop (hard), which may confirm that the reconnection site is close to the looptop source.

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