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

15th Annual International Astrophysics Conference: "The Science of Ed Stone: Celebrating his 80th Birthday"

物理学;天文学

Effenberger, Frederic^1 ; Da Costa, Fátima Rubio^1 ; Petrosian, Vahé^1

Department of Physics, KIPAC, Stanford University, Stanford

CA

94305, United States^1

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;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/767/1/012005/pdf
DOI  :  10.1088/1742-6596/767/1/012005

学科分类：天文学(综合)

来源: IOP

【 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.