Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.83h&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
We present new results from the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) of solar X-ray emission not associated with active regions, sunspots, or flares (the quiet Sun). RHESSI has greater sensitivity in the 5-25 keV range than previous missions, but since the quiet Sun sources may be well-dispersed spatially across the disk, RHESSI's normal imaging technique is not well suited to the task. Instead, we obtain observations in a special mode ("fan-beam modulation," Hannah et al. RSI 78, 024501, 2007) to "chop" the quiet solar signal. This technique has been used fourteen times between between June 2005 and June 2008, obtaining limits to the emission between 3-200 keV. These limits improve on those previously reported (Hannah et al. ApJ 659L, 77, 2007). They are both lower and also extend the energy range covered by the pre-RHESSI results. We use the new limits to constrain the possible properties of the thermal and non-thermal emission of the quiet Sun. In particular we discuss the possible properties of hard X-ray nanoflares and the implications for nanoflare coronal heating models.
Hannah Iain G.
Hudson Hugh S.
Hurford Gordon J.
Lin Robert P.
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