Title of Abstract
NuSTAR's First Solar Observations
Solar Physics General Session
Iain G. Hannah
University of Glasgow
D. Smith, A. Marsh (Santa Cruz), L. Glesener (UC Berkeley), S. Krucker (& FHNW), H. Hudson (& Glasgow), B. Grefenstette, K. Madsen, R. Mewaldt (Caltech), S. White (AFRL), A. Shih, S. Christe (GSFC), A. Caspi (SWRI), M. Pivovaroff, J. Vogel (LLNL)
Summary (maximum 250 words)
We present imaging spectroscopy of the Sun with the NuSTAR hard X-ray (HXR) telescope, searching for high temperature and non-thermal emission in the “non-flaring” Sun. Launched in 2012, NASA's astrophysics mission NuSTAR uses focusing optics to directly image X-rays between ~2-80 keV. In the band below ~50 keV the field of view is 12'x12' and the instrument has an energy resolution of ~0.4 keV. Although not optimized for solar observations, NuSTAR’s high sensitivity can probe previously inaccessible X-ray emission from the Sun. For instance the weak X-ray signatures of a coronal energy release region in occulted flares or searching for the non-thermal emission from “nanoflares” in non-flaring active regions and the quiet Sun. NuSTAR observed the Sun three times during late 2014 and we present these first directly imaged hard X-rays from non-flaring active regions. Using NuSTAR’s imaging spectroscopy capabilities we are able to derive the active region’s multi-thermal characteristics. We will also discuss a hot (>3MK) source that appears to linger high in the corona and could be associated with the occulted active region AR12192.


Session Time
09:00 - 10:30
Talk start