Regularized energy-dependent solar flare hard x-ray spectral index

Details Regularized energy-dependent solar flare hard x-ray spectral index Regularized energy-dependent solar flare hard x-ray spectral index

2005-06-05

arxiv.org/abs/astro-ph/0506097v1

Astronomy and Astrophysics

Astrophysics

13 pages; 5 figures, Solar Physics in press

Scientific paper

10.1007/s11207-005-1101-y

The deduction from solar flare X-ray photon spectroscopic data of the energy dependent model-independent spectral index is considered as an inverse problem. Using the well developed regularization approach we analyze the energy dependency of spectral index for a high resolution energy spectrum provided by Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The regularization technique produces much smoother derivatives while avoiding additional errors typical of finite differences. It is shown that observations imply a spectral index varying significantly with energy, in a way that also varies with time as the flare progresses. The implications of these findings are discussed in the solar flare context.

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