Solar X-rays from Axions: Rest-Mass Dependent Signatures

The spectral shape of solar X-rays is a power law. The more active the Sun is, the less steep the distribution. This behaviour can be explained by axion regeneration to X-rays occurring ~400km deep into the photosphere. Their down-comptonization reproduces the measured spectral shape, pointing at ax...

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Bibliographic Details
Published in:arXiv.org 2010-03
Main Authors: Zioutas, Konstantin, Tsagri, Mary, Semertzidis, Yannis, Papaevangelou, Thomas, Gardikiotis, Antonios, Dafni, Theopisti, Anastassopoulos, Vassilis
Format: Article
Language:English
Subjects:
Photosphere
Regeneration
Soft x rays
Solar x rays
X ray spectra
X-rays
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Summary:The spectral shape of solar X-rays is a power law. The more active the Sun is, the less steep the distribution. This behaviour can be explained by axion regeneration to X-rays occurring ~400km deep into the photosphere. Their down-comptonization reproduces the measured spectral shape, pointing at axions with rest mass m_a~17 meV/c2, without contradicting astrophysical-laboratory limits. Directly measured soft X-ray spectra from the extremely quiet Sun during 2009 (SphinX mission), though hitherto overlooked, fitt the axion scenario.
ISSN:2331-8422