The Optical Solar Limb As Observed By RHESSI

Details The Optical Solar Limb As Observed By RHESSI The Optical Solar Limb As Observed By RHESSI

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.3005f&link_type=abstract

American Astronomical Society, SPD meeting #37, #30.05; Bulletin of the American Astronomical Society, Vol. 38, p.257

Astronomy and Astrophysics

Astronomy

Scientific paper

The RHESSI limb sensors routinely make precise differentialobservations of the solar limb shape and its time variations. Therandom error for a single point is less than 40 milli-arcsecondsand in regular operation we obtain about 100 samples per second.The database now exceeds four years, following RHESSI's launch inFebruary 2002. Because of RHESSI's rotation (nominally at 4 secperiod) the basic measurement resembles that pioneered by Dicke's"Oblateness Telescope". The data clearly show several solar features,including the oblateness as well as sunspots, faculae, and p-modes.We give a general description and report preliminary values for theoblateness. We find the oblateness measurement to depend sensitivelyon the level of magnetic activity, and give a representative value of9.72 +/- 0.19 MAS (statistical error only) for a 60-hour intervalstarting 10:15 UT 14 August 2004.

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