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Proceedings Paper

Highly accurate photometric equalization of long sequences of coronal images
Author(s): Antoine Llebaria; Arnaud Thernisien
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Paper Abstract

The LASCO-C2 and C3 coronagraphs aboard the SOHO solar observatory have been providing for the last five years an unprecedented long sequence of coronal images at high cadence (about 100 images/day). To build temporal sequences for movie displays as well as for science analysis purpose, we need a photomety having a relative accuracy better than 0.1 percent. In this paper we address this problem showing how image to image regression as well as long term correction of drifts induced by Wiener-Levy stochastic processes are able to solve this challenge. The use of time derivatives of synoptic maps to correct and verify the full procedure and comparison with more classical methods like star calibration are discussed. Difficulties due to brightening events as coronal mass ejections, showers of cosmic rays, etc., as well as those due to telemetry gaps are also addressed.

Paper Details

Date Published: 1 November 2001
PDF: 12 pages
Proc. SPIE 4477, Astronomical Data Analysis, (1 November 2001); doi: 10.1117/12.447183
Show Author Affiliations
Antoine Llebaria, Lab. d'Astrophysique de Marseille (France)
Arnaud Thernisien, Lab. d'Astrophysique de Marseille (France)

Published in SPIE Proceedings Vol. 4477:
Astronomical Data Analysis
Jean-Luc Starck; Fionn D. Murtagh, Editor(s)

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