Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001spie.4477..265l&link_type=abstract
Proc. SPIE Vol. 4477, p. 265-276, Astronomical Data Analysis, Jean-Luc Starck; Fionn D. Murtagh; Eds.
Astronomy and Astrophysics
Astronomy
4
Scientific paper
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.
Llebaria Antoine
Thernisien Arnaud
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