Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.3719f&link_type=abstract
American Astronomical Society Meeting 204, #37.19; Bulletin of the American Astronomical Society, Vol. 36, p.712
Astronomy and Astrophysics
Astronomy
Scientific paper
The Solar Aspect System (SAS) of the rotating (at 15 rpm) RHESSI spacecraft has three subsystems. Each of these measures the position of the limb by sampling the full solar chord profile with a linear CCD using a narrow-band filter at 670 nm. With a CCD pixel size of 1.7 arcsec, the accuracy of each of the six limb positions is theoretically better than 50 mas using four pixels at each limb. Since the launch of RHESSI early 2002, solar limbs have been sampled with at least 100 Hz. That provides database currently containin 4 × 109 single radius measurements. The main function of SAS is to determine the RHESSI pointing relative to Sun center. The observed precision of this determination has a typical instantaneous (16 Hz) value of the order of 50 mas (rms). We present initial RHESSI observations of the radius, including signatures of oblateness and of magnetic activity (spots and faculae).
Fivian Martin D.
Hudson Hugh S.
Lin Robert P.
No associations
LandOfFree
Variations of Solar Radius: Observations with RHESSI does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Variations of Solar Radius: Observations with RHESSI, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variations of Solar Radius: Observations with RHESSI will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1172121