Hard X-ray morphology of the X1.3 April 25, 2014 partially occulted limb solar flare

[摘要] At hard X-ray energies, the bright footpoint emission from solar flare loops often prevents a detailed analysis of the weaker loop-top source morphology due to the limited dynamic range available for X-ray imaging. Here, we study the X1.3 April 25, 2014 flare with the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). This partially occulted limb flare allows the analysis of the loop-top emission in isolation. We present results on the flare light curve at different energies, the source morphology from X-ray imaging and a detailed spectral analysis of the different source components by imaging spectroscopy. The loop-top source, a likely site of particle acceleration, shows a clear composition of different emission components. The results indicate the opportunities that detailed imaging of hard X-rays can provide to learn about particle acceleration, transport and heating processes in solar flares.

[发布机构] Department of Physics, KIPAC, Stanford University, Stanford; CA; 94305, United States^1

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Heating process;Imaging spectroscopy;Light curves;Limited dynamic ranges;Particle acceleration;Reuven Ramaty High Energy Solar Spectroscopic Imager;Top emission;Xray imaging