X-ray and radio observations in the initial development of an X-class solar flare

Details X-ray and radio observations in the initial development of an X-class solar flare X-ray and radio observations in the initial development of an X-class solar flare

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..441f&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Computer Science

X-Ray, Radio Spectra, Solar Flares, Initial Phase

Scientific paper

The EIT/SOHO and SXT/YOHKOH plasma ejecta accompanied by an unusual drifting radio continuum and early hard X-ray emission observed prior to the impulsive phase of the September 24, 2001, X-class flare are analyzed. The paper presents some of the first reported observations from the new Hard X-ray Spectrometer instrument (HXRS), as well as imaging data from YOHKOH plus radio spectral observations in the decimetric band. The early hard X-ray observations revealed a soft spectrum that we interpret as non-thermal, located within loop structures observed in soft X-rays along the magnetic neutral line. The hard X-ray emission continued for more than one hour. In the initial phase of the flare, the hard X-ray emission arose in structures closely identifiable with the early soft X-ray loops, which appeared to evolve smoothly into the post-flare loop system of the flare maximum. At this time the decimeter spectra showed loosely-correlated spiky emission at frequencies consistent with the densities inferred from soft X-rays, but with rapid drifts implying motions along magnetic field lines.

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