NDLI: Photometric Calibration of the Lasco-C3 Coronagraph Using Stars

Content Provider	Springer Nature Link
Author	Thernisien, A. F. Morrill, J. S. Howard, R. A. Wang, D.
Copyright Year	2006
Abstract	The LASCO-C3 coronagraph on SOHO, launched in December 1995, has been collecting images of the corona and background star fields in a regular manner since 1996. This instrument contains a number of broadband filters with various passbands in the range between 400 and 1100 nm. The filter used most often has been the Clear filter (400–900 nm) but there are four other filters with about 100 nm passbands that are also used periodically. Preliminary calibration of the C3 optical system was done before flight and a number of techniques that use star intensities or magnitudes and position have been applied during flight. In order to understand the long-term behavior of the C3 instrument, we have recently performed an analysis of LASCO data that examines the observed intensities of a set of moderately bright stars whose spectra is known from 13 color photometry. Using these star spectra and the observed count rates we have derived the photometric calibration factors of the C3 coronagraph for all five color filters with an absolute precision of about ± 7%. Observations with the Clear filter have been used to look for long-term trends in the instrument sensitivity. The observations indicate a very slight decrease in the instrument sensitivity of about 3.5% over the 8 years studied here.
Starting Page	155
Ending Page	169
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	233
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Astronomy Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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