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The Large Angle Spectroscopic Coronagraph (LASCO)
Authors:G E Brueckner  R A Howard  M J Koomen  C M Korendyke  D J Michels  J D Moses  D G Socker  K P Dere  P L Lamy  A Llebaria  M V Bout  R Schwenn  G M Simnett  D K Bedford and C J Eyles
Institution:(1) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375-5320, Washington D.C., USA;(2) Laboratoire d'Astronomie Spatiale, Marseille, France;(3) Max-Planck-Institut für Aeronomie, Lindau, Germany;(4) Space Research Group, School of Physics and Space Research, University of Birmingham, Birmingham, U.K.
Abstract:The Large Angle Spectroscopic Coronagraph (LASCO) is a three coronagraph package which has been jointly developed for the Solar and Heliospheric Observatory (SOHO) mission by the Naval Research Laboratory (USA), the Laboratoire d'Astronomie Spatiale (France), the Max-Planck-Institut für Aeronomie (Germany), and the University of Birmingham (UK). LASCO comprises three coronagraphs, C1, C2, and C3, that together image the solar corona from 1.1 to 30 Rodot (C1: 1.1 – 3 Rodot, C2: 1.5 – 6 Rodot, and C3: 3.7 – 30 Rodot). The C1 coronagraph is a newly developed mirror version of the classic internally-occulted Lyot coronagraph, while the C2 and C3 coronagraphs are externally occulted instruments. High-resolution imaging spectroscopy of the corona from 1.1 to 3 Rodot can be performed with the Fabry-Perot interferometer in C1. High-volume memories and a high-speed microprocessor enable extensive on-board image processing. Image compression by a factor of about 10 will result in the transmission of 10 full images per hour.
Keywords:Sun  Corona  Coronagraph
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