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

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Presentation transcript:

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

Quiet Sun SED

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) *

Albedo from diffuse component Churazov et al. 2008

Quiet Sun in hard X-rays, current limits

The tail-dragging program

The thermal limits

The non-thermal limits

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