No. 188. "Impulse Response Flares and Gamma Rays," by S. White and H. Hudson.  A simplifying paradigm may describe acceleration to the highest energies in flares. See

http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/%22Impulse_Response_Flares%22_and_Gamma_Rays

Older Nuggets are available at
http://sprg.ssl.berkeley.edu/~tohban/wiki/index.php/RHESSI_Science_Nuggets
 (the current series, 2008-present), and at
http://sprg.ssl.berkeley.edu/~tohban/nuggets/ (the original series, 2005-2008).

We publish these at roughly two-week intervals and welcome contributions, which should be 
related, at least loosely, to RHESSI science.