Multi-wavelength observations of POST flare loops in two long duration solar flares

Details Multi-wavelength observations of POST flare loops in two long duration solar flares Multi-wavelength observations of POST flare loops in two long duration solar flares

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..911h&link_type=abstract

Astronomy and Astrophysics, v.337, p.911-920 (1998)

Astronomy and Astrophysics

Astrophysics

35

Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

We have analysed two Long Duration solar Events (LDEs) which produced large systems of Post Flare Loops (PFLs) and which have been observed by Yohkoh and ground-based observatories. Using the Maximum Entropy Method (MEM) image synthesis technique with new modulation patterns we were able to make hard X-ray (HXR) images of the post flare loops recorded in the L Channel (13.9-22.7 keV) of the Yohkoh Hard X-ray Telescope. We obtained co-aligned 2-D maps in Hα (10(4) K), in soft X-rays (5x 10(6) K) and in hard X-rays (20x 10(6) K). We conclude that the soft X-ray (SXR) loops lie higher than the Hα loops and the former are overlaid by HXR emission. This is suggestive of the magnetic reconnection process. However some details are not consistent with the standard models. Firstly the separation between the HXR source and the SXR loop increases with time, with the HXR source being approximately a factor of five larger than the equivalent source in impulsive flares. Secondly the cooling times deduced from observations are longer than the theoretically expected ones and the discrepancy increases with time. We review the current models in view of these results.

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