1. Coronal Hard X-rays Come of Age H. S. Hudson SSL, UC Berkeley

2. St. Andrews Jan. 20, 2009 What are coronal hard X-rays? Direct emission from dynamic structures in the corona, rather than Neupert/SHS/footpoint paradigm An alternative source of knowledge (viz. radio) on particle distribution functions RHESSI (the 4th HXR imager) has shown that one can routinely see coronal hard X-ray emission

3. St. Andrews Jan. 20, 2009 A deceptive view of flare physics?

4. St. Andrews Jan. 20, 2009 Old New Coronal Hard X-rays: Old & New

5. St. Andrews Jan. 20, 2009 Conclusions Krucker et al., A&A Review 2008 All major events show high coronal hard X-ray sources Emission detected even at energies above 100 keV Focusing optics holds great promise to extend this diagnostic tool by orders of magnitude in sensitivity

6. St. Andrews Jan. 20, 2009 Challenge How can we make new progress in high-energy solar physics? - a RHESSI follow-on - a Nobeyama follow-on (FASR)