Mercury Transit for Stray Light Evaluation: IPM-THEMIS Case
| Autor: | G. Mainella, G. Ceppatelli, W. Mattig, Carine Briand |
|---|---|
| Přispěvatelé: | Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique des plasmas, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Kiepenheuer-Institut für Sonnenphysik (KIS), Instituto de Astrofísica de Canarias (IAC), Fundación Galileo Galilei - INAF |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Physics
business.industry Scattering Stray light chemistry.chemical_element Astronomy and Astrophysics Solar disk law.invention Mercury (element) Telescope Optics Optical path chemistry Space and Planetary Science law Astrophysics::Earth and Planetary Astrophysics Scattered light business [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Communication channel |
| Zdroj: | Solar Physics Solar Physics, 2006, 234, pp.187-201. ⟨10.1007/s11207-006-0033-5⟩ |
| ISSN: | 0038-0938 1573-093X |
| DOI: | 10.1007/s11207-006-0033-5⟩ |
| Popis: | 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 obser- vation 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 de- duced for the two channels taking into account the observations on the limb and on Mercury's disk. The goal of this paper is to underline the limits of determining the spread function from limb measurements to correct disk observations. Indeed, we show that if a diaphragm is located in the optical path of scattering surfaces, then the spread function deduced from limb measurements can be underestimated compared to the one required for disk observations. The case is illustrated with the results of the IPM-THEMIS instrument. The spread function deduced from limb measurements is able to correct disk observations in the broad-band channel but not in the spectral channel, even if the two channels are illuminated through the same telescope configuration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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