Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2222f&link_type=abstract
American Astronomical Society Meeting 210, #22.22; Bulletin of the American Astronomical Society, Vol. 39, p.128
Astronomy and Astrophysics
Astronomy
Scientific paper
The Solar Aspect System of the RHESSI spacecraft scans the limb at the 4 sec rotation period of the spacecraft, producing a large quantity of precise differential measurements of the solar radius at optical wavelengths (monochromatic at 670 nm). These data provide the most precise determinations of the oblateness prior in particular to the launch of the Picard mission in 2008. The statistical error of an individual data point is now below 20 mas (milli arc sec) and we hope to improve on this still further. The database of about 100 samples per second now exceeds five years, following RHESSI's launch in February 2002. We present results on solar shape and its time variations, including several signatures of solar magnetic activity (spots and faculae). We report new improvements made possible by an analysis of subtle systematic errors due to temperature variations in the spacecraft and telescope and extensive modeling of the solar limb shape.
Fivian Martin
Hudson Hugh S.
Zahid Jabran H.
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