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Hard X-rays from the quiet Sun H. S. Hudson Space Sciences Laboratory, University of California, Berkeley, USA.

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Presentation on theme: "Hard X-rays from the quiet Sun H. S. Hudson Space Sciences Laboratory, University of California, Berkeley, USA."— Presentation transcript:

1 Hard X-rays from the quiet Sun H. S. Hudson Space Sciences Laboratory, University of California, Berkeley, USA

2 Quiet Sun SED

3 Exotic mechanisms Albedo from diffuse component (Churazov et al. 2008) Cosmic-ray secondaries (Seckel et al. 1991; MacKinnon 2007) X-ray shadow Axions via Primakoff effect (Carlson & Tseng 1996) * Inverse Compton source (Fermi  -ray result) *http://sprg.ssl.berkeley.edu/~tohban/nuggets/?page=article&article_id=50

4 Albedo from diffuse component Churazov et al. 2008

5 Quiet Sun in hard X-rays, current limits http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/Quiet_Sun_III

6 The tail-dragging program

7 The thermal limits

8 The non-thermal limits

9 Conclusions The RHESSI off-Sun experiments are complete We don’t see any significant flux from the quiet Sun “Nanoflares” are not a favored explanation of coronal heating http://adsabs.harvard.edu/abs/2010arXiv1009.2918H

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