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Intercomparison of the LASCO-C2, SECCHI-COR1, SECCHI-COR2, and Mk4 CoronagraphsIn order to assess the reliability and consistency of white-light coronagraph measurements, we report on quantitative comparisons between polarized brightness [pB] and total brightness [B] images taken by the following white-light coronagraphs: LASCO-C2 on SOHO, SECCHI-COR1 and -COR2 on STEREO, and the ground-based MLSO-Mk4. The data for this comparison were taken on 16 April 2007, when both STEREO spacecraft were within 3.1 deg. of Earth’s heliographic longitude, affording essentially the same view of the Sun for all of the instruments. Due to the difficulties of estimating stray-light backgrounds in COR1 and COR2, only Mk4 and C2 produce reliable coronal-hole values (but not at overlapping heights), and these cannot be validated without rocket flights or ground-based eclipse measurements. Generally, the agreement between all of the instruments’ pB values is within the uncertainties in bright streamer structures, implying that measurements of bright CMEs also should be trustworthy. Dominant sources of uncertainty and stray light are discussed, as is the design of future coronagraphs from the perspective of the experiences with these instruments.
Document ID
20140006622
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1007/s11207-012-0028-3
Authors
Frazin, Richard A. (Michigan Univ. Ann Arbor, MI, United States)
Vasquez, Alberto M. (Instituto de Astronomia y Fisica del Espacio Buenos Aires, Argentina)
Thompson, William T. (Adnet Systems, Inc. Greenbelt, MD, United States)
Hewett, Russell J. (Illinois Univ. Urbana, IL, United States)
Lamy, Philippe (Centre National de la Recherche Scientifique Marseilles, France)
Llebaria, Antoine (Centre National de la Recherche Scientifique Marseilles, France)
Vourlidas, Angelos (Naval Research Lab. Washington, DC, United States)
Burkepile, Joan (National Center for Atmospheric Research Boulder, CO, United States)
Date Acquired
June 3, 2014
Publication Date
September 1, 2012
Publication Information
Publication: Solar Physics
Publisher: Springer
Volume: 280
Issue: 1
Subject Category
Instrumentation And Photography
Solar Physics
Report/Patent Number
GSFC-E-DAA-TN9433
Funding Number(s)
CONTRACT_GRANT: NNG12PL17C
CONTRACT_GRANT: NNX08AT43H
CONTRACT_GRANT: NNX08AJ09G
CONTRACT_GRANT: NNG09EK11I
CONTRACT_GRANT: UBA 20020090100264
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Coronagraph
Solar Corona
Electron density

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