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

Kontar, E.P. and MacKinnon, A.L. (2005) Regularized energy-dependent solar flare hard x-Ray spectral index. Solar Physics, 227(2), pp. 299-310. (doi: 10.1007/s11207-005-1101-y)

Abstract

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 <i>Ramaty</i> <i>High</i> <i>Energy</i> <i>Solar</i> <i>Spectroscopic</i> <i>Imager</i> (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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: MacKinnon, Dr Alexander and Kontar, Professor Eduard
• Authors: Kontar, E.P., and MacKinnon, A.L.
• Subjects: Q Science > QB Astronomy
• College/School: College of Science and Engineering > School of Physics and Astronomy; College of Social Sciences > School of Education > Interdisciplinary Science Education Technologies and Learning
• Journal Name: Solar Physics
• ISSN: 0038-0938

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