Multi-Wavelength Analysis of the Flare on 2 October 1993

Details Multi-Wavelength Analysis of the Flare on 2 October 1993 Multi-Wavelength Analysis of the Flare on 2 October 1993

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998soph..182..163f&link_type=abstract

Solar Physics, v. 182, Issue 1, p. 163-177 (1998).

Physics

7

Scientific paper

By use of Yohkoh hard X-ray flux and soft X-ray images, and of vector magnetograms and 2D spectral observations, a 1N/C6.5 flare observed on 2 October 1993 is analysed in detail. Evidence is provided not only morphologically but also quantitatively that the dynamics at kernels A and C of the flare in the impulsive phase were controlled mainly by electron beam bombardment, while the heating of kernel B is mainly due to heat conduction. By plotting the energy gradient of the electron energy flux as a function of energy for the various spectral indexes observed during the flare, the acceleration mechanism is found to be such that there is a constant energy E0, close to 20 keV, for which the electron flux d F1/dE is constant. It is shown that such a conclusion can be reached more directly by using the photon flux, which in that case must be constant for E=E0, whatever the value of the power index. This result implies also that the electron spectrum is represented by a power law and that the X-ray photons are produced in a thick target. Instantaneous momentum balance is shown to exist between the upflowing soft X-ray-emitting and the downflowing Hα- emitting plasma at the kernels of the flare. The observed Hα red asymmetry is well reproduced by the non-LTE computation, with the down-moving condensation included. The observation of the magnetic field suggests that the flare was triggered probably by magnetic flux emergence.

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