Mercury Transit for Stray Light Evaluation: IPM-THEMIS Case
Abstract
Mercury's transit on the solar disk offers ideal conditions to determine the stray light level of instruments. We present here the results on the stray light level deduced from the observation of the Mercury transit on 2003 May 7th at the secondary focus of the THEMIS telescope with the broad-band and spectral channels of the IPM instrument. The scattered light in the broad-band channel is about 17% and about 25% in the spectral channel. The spread function was deduced for the two channels taking into account the observations on the limb and on Mercury's disk.
- Publication:
-
Solar Physics
- Pub Date:
- March 2006
- DOI:
- 10.1007/s11207-006-0033-5
- Bibcode:
- 2006SoPh..234..187B
- Keywords:
-
- Mercury;
- Scattered Light;
- Ideal Condition;
- Optical Path;
- Light Level