HR: 0830h
AN: SH21B-0162    [PDF]
TI: The Non-flare Emisson Measure Above 5 MK Observed By RHESSI and SXI
AU: * McTiernan, J M
EM: jimm@ssl.berkeley.edu
AF: Space Sciences Lab, University of California, 7 Gauss Way, Berkeley, CA 94720 United States
AU: Klimchuk, J A
EM: klimchuk@nrl.navy.mil
AF: Naval Research Lab, 4555 Overlook Ave., SW, Washington, DC 20375 United States
AB: Since RHESSI was launched in February 2002, it has observed thousands of solar flares. It also observes solar emission above 3 keV when there are no observeable flares present. In this work we present measurements of the non-flare Temperature and Emission Measure for the period from October 2002 through July 2003. The temperature is relatively stable in the 6 - 8 MK range (this is not surprising considering that RHESSI cannot reliably measure temperatures less than about 5 MK). The Emission Measure varies in the range from approximately 1.0e49 to 1.0e50, with higher values associated with periods of more solar activity. Since RHESSI is an imaging spectrometer, we locate the source of the emission when possible. Preliminary results show that the source can be associated with active regions. We also present comparisons with SXI data, and measure the Differential Emission Measure for the range from 1 MK to 10 MK.
DE: 7509 Corona
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting