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| Paper: |
X-Ray Searches for Solar Axions |
| Volume: |
455, 4th Hinode Science Meeting: Unsolved Problems and Recent Insights |
| Page: |
25 |
| Authors: |
Hudson, H. S.; Acton, L. W.; DeLuca, E. E.; Hannah, I. G.; Reardon, K.; Van Bibber, K. |
| Abstract: |
Axions generated thermally in the solar core can convert nearly
directly to X-rays as they pass through the solar atmosphere via
interaction with the magnetic field. The result of this conversion
process would be a diffuse centrally-concentrated source of few-keV
X-rays at disk center; it would have a known dimension, of order 10%
of the solar diameter, and a spectral distribution resembling the
blackbody spectrum of the solar core. Its spatial structure in detail
would depend on the distribution of mass and field in the solar
atmosphere. The brightness of the source depends upon these factors
as well as the unknown coupling constant and the unknown mass of the
axion; this particle is hypothetical and no firm evidence for its
existence has been found yet. We describe the solar magnetic
environment as an axion/photon converter and discuss the upper limits
obtained by existing and dedicated observations from three solar X-ray
observatories: Yohkoh, RHESSI, and Hinode. |
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