Relative and (maybe) Absolute RHESSI Detector Efficiency: 2002-2008

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Introduction

RHESSI has now been observing for nearly eight years. How has detector sensitivity changed since it was launched?

Figure 1:This is the relative detector efficiency for front detectors 3, 4, 5, 6, 8, and 9

What about absolute sensitivity?

Figure 2:GOES Hi channel flux versus RHESSI detector 1 Emission Measure for the full sample.

Looks like a blob for small flares, do the same plot for 6 to 20 keV RHESSI detector 1 count rate.

Figure 3:GOES Hi channel flux versus RHESSI detector 1 6 to 20 keV count rate for the full sample.

Restrict to the flares with greater than 1.0e45 emission measure. This leaves 2580 flares.

Figure 4:GOES Hi channel flux versus RHESSI detector 1 6 to 20 keV count rate for the flares with EM greater than 1.0e45 cm^(-3).

Plot 60 day averages as a function of time.

Figure 4:60 day averages of the ratio of RHESSI 6 to 20 keV counts to GOES fluxes for the flares with EM greater than 1.0e45 cm^(-3).

Show samples of flare ratio results for two different time ranges.

Figure 5:The ratio of RHESSI 6 to 20 keV counts to GOES fluxes for flares with EM greater than 1.0e45 cm^(-3) fortwo different time periods, one early in the mission, one just before anneal,