RHESSI observations of solar radius

Details RHESSI observations of solar radius RHESSI observations of solar radius

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh11a0241f&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH11A-0241

Physics

7504 Celestial Mechanics, 7522 Helioseismology, 7529 Photosphere, 7538 Solar Irradiance, 7544 Stellar Interiors And Dynamo Theory

Scientific paper

The Solar Aspect System (SAS) of the rotating (at 15 rpm) RHESSI spacecraft has three simple solar optical telescopes. Each of these measures the position of the limb by sampling the solar chord profile with a linear CCD using a narrow bandwidth filter at 670 nm. With a resolution of each CCD of 1.7 arcsec/pixel, the precision of each of the 6 limb positions is observed to be better than 50 mas using 4 pixels at each limb. Since the launch of RHESSI early 2002, data have been obtained at a rate of at least 100 samples/sec. This has provided a database of currently 7~×~109 individual measurements. The main function of SAS is to determine the RHESSI pointing relative to Sun center. Using these data we observe the solar oblateness and see signatures of magnetic activity (spots and faculae).

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