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)

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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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