The Non-flare Emisson Measure Above 5 MK Observed By RHESSI and SXI

Details The Non-flare Emisson Measure Above 5 MK Observed By RHESSI and SXI The Non-flare Emisson Measure Above 5 MK Observed By RHESSI and SXI

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0162m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0162

Physics

7509 Corona

Scientific paper

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.

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