2005/04/01 by Eduard P. Kontar, Alexander L. MacKinnon, A. L. MacKinnon · 1 citation
Computer Science · Physics and Astronomy · #Astronomy #Astrophysics #Computational physics #Context (archaeology) #Energy (signal processing) #Flare #Inverse #Optics #Photon #Physics #Regularization (linguistics) #Solar Radiation and Photovoltaics #Solar and Space Plasma Dynamics #Solar flare #Spectral index #Spectral line #Spectral resolution #astro-ph
paper · pdf · doi:10.1007/s11207-005-1101-y
13 pages; 5 figures, Solar Physics in press
openalex publication_date 2005/04/01 · arxiv created 2005/06/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.