NDLI: Intercomparison of the LASCO-C2, SECCHI-COR1, SECCHI-COR2, and Mk4 Coronagraphs

Content Provider	Springer Nature Link
Author	Frazin, Richard A. Vásquez, Alberto M. Thompson, William T. Hewett, Russell J. Lamy, Philippe Llebaria, Antoine Vourlidas, Angelos Burkepile, Joan
Copyright Year	2012
Abstract	In 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$^{∘}$ 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.
Starting Page	273
Ending Page	293
Page Count	21
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	280
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coronagraph Electron density Solar corona Meteorology/Climatology Astrophysics and Astroparticles Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Intercomparison of the LASCO-C2, SECCHI-COR1, SECCHI-COR2, and Mk4 Coronagraphs

Intercomparison of the lasco-c2, secchi-cor1, secchi-cor2, and mk4 coronagraphs

Three-Dimensional Electron Density from Tomographic Analysis of LASCO-C2 Images of the K-Corona Total Brightness

Background Subtraction for the SECCHI/COR1 Telescope Aboard STEREO

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

The Impact of Geometry on Observations of CME Brightness and Propagation

Latitudinal and Solar-Cycle Variations of the White-Light Corona from SOHO/LASCO Observations

Photometric Calibration of the LASCO-C2 Coronagraph over 14 Years (1996 – 2009)

Update of the Photometric Calibration of the LASCO-C2 Coronagraph Using Stars

Intercomparison of the LASCO-C2, SECCHI-COR1, SECCHI-COR2, and Mk4 Coronagraphs

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