Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh23a1623z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH23A-1623
Physics
7524 Magnetic Fields, 7529 Photosphere
Scientific paper
We use observations from the solar aspect sensor of RHESSI to characterize the facular limb brightening function. The RHESSI observations, made with a rotating telescope in space, have great advantages in the rejection of systematic errors in the very precise photometry required for such an observation. The facular photometry is differential relative to a mean background limb-darkening function. The data base consists of about 1,000 images per day from linear CCDs with 1.73 arc sec square pixels, observing a narrow band at 670 nm. Each image shows a chord crossing the disk at a different location as the spacecraft rotates and precesses around its nominal solar pointing, with amplitude of a few arc sec. We reassemble these line images into synoptic images with a relatively low time cadence but an almost full coverage of more than six years. We further mask these images against SOHO/EIT 284A images in order to select magnetic regions. The resulting mean limb-darkening function is clearly resolved in radius and has a maximum at mu = 0.24 and approaches zero at the limb, consistent with Spruit's "hot wall" model. The contrast is positive at disk center, and we discuss explanations for this.
Chapman Gary
Fivian Martin D.
Hudson Hugh H.
Zahid Jabran H.
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