STEREO SECCHI COR1-A/B Intercalibration at 180° Separation

Details STEREO SECCHI COR1-A/B Intercalibration at 180° Separation STEREO SECCHI COR1-A/B Intercalibration at 180° Separation

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011soph..272..215t&link_type=abstract

Solar Physics, Volume 272, Issue 1, pp.215-225

Physics

Instrumental Effects, Corona

Scientific paper

The twin Solar Terrestrial Relations Observatory (STEREO) spacecraft reached a separation angle of 180° on 6 February 2011. This provided a unique opportunity to test the intercalibration between the Sun-Earth Connection Coronal and Heliospheric Investigation (SECCHI) telescopes on both spacecraft for areas above the limb. So long as the corona is optically thin, at 180° separation each spacecraft sees the same corona from opposite directions. Thus, the data should appear as mirror images of each other. We report here on the results of the comparison of the images taken by the inner coronagraph (COR1) on the STEREO- Ahead and - Behind spacecraft in the hours when the separation was close to 180°. We find that the intensity values seen by the two telescopes agree with each other to a high degree of accuracy. This validates both the radiometric intercalibration between the COR1 telescopes, and the method used to remove instrumental background from the images. The relative error between COR1-A and COR1-B is found to be less than 10-9 B/ B &sun; over most of the field-of-view, growing to a few ×10-9 B/ B &sun; for the brighter pixels near the edge of the occulter. The primary source of error is the background determination. We also report on the analysis of star observations which show that the absolute radiometric calibration of either COR1 telescope has not changed significantly since launch.

Affiliated with

Also associated with

No associations

Rating

STEREO SECCHI COR1-A/B Intercalibration at 180° Separation 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 STEREO SECCHI COR1-A/B Intercalibration at 180° Separation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and STEREO SECCHI COR1-A/B Intercalibration at 180° Separation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1667864