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Proceedings Paper

Earth-Affecting Solar Causes Observatory (EASCO): a mission at the Sun-Earth L5
Author(s): Nat Gopalswamy; Joseph M. Davila; Frédéric Auchère; Jesper Schou; Clarence M. Korendyke; Albert Shih; Janet C. Johnston; Robert J. MacDowall; Milan Maksimovic; Edward Sittler; Adam Szabo; Richard Wesenberg; Suzanne Vennerstrom; Bernd Heber
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Paper Abstract

Coronal mass ejections (CMEs) and corotating interaction regions (CIRs) as well as their source regions are important because of their space weather consequences. The current understanding of CMEs primarily comes from the Solar and Heliospheric Observatory (SOHO) and the Solar Terrestrial Relations Observatory (STEREO) missions, but these missions lacked some key measurements: STEREO did not have a magnetograph; SOHO did not have in-situ magnetometer. SOHO and other imagers such as the Solar Mass Ejection Imager (SMEI) located on the Sun-Earth line are also not well-suited to measure Earth-directed CMEs. The Earth-Affecting Solar Causes Observatory (EASCO) is a proposed mission to be located at the Sun-Earth L5 that overcomes these deficiencies. The mission concept was recently studied at the Mission Design Laboratory (MDL), NASA Goddard Space Flight Center, to see how the mission can be implemented. The study found that the scientific payload (seven remote-sensing and three in-situ instruments) can be readily accommodated and can be launched using an intermediate size vehicle; a hybrid propulsion system consisting of a Xenon ion thruster and hydrazine has been found to be adequate to place the payload at L5. Following a 2-year transfer time, a 4-year operation is considered around the next solar maximum in 2025.

Paper Details

Date Published: 6 October 2011
PDF: 12 pages
Proc. SPIE 8148, Solar Physics and Space Weather Instrumentation IV, 81480Z (6 October 2011); doi: 10.1117/12.901538
Show Author Affiliations
Nat Gopalswamy, NASA Goddard Space Flight Ctr. (United States)
Joseph M. Davila, NASA Goddard Space Flight Ctr. (United States)
Frédéric Auchère, Institut d'Astrophysique Spatiale, CNRS, Univ. Paris-Sud 11 (France)
Jesper Schou, Stanford Univ. (United States)
Clarence M. Korendyke, U.S. Naval Research Lab. (United States)
Albert Shih, NASA Goddard Space Flight Ctr. (United States)
Janet C. Johnston, Air Force Research Lab. (United States)
Robert J. MacDowall, NASA Goddard Space Flight Ctr. (United States)
Milan Maksimovic, LESIA, Univ. de Paris Meudon (France)
Edward Sittler, NASA Goddard Space Flight Ctr. (United States)
Adam Szabo, NASA Goddard Space Flight Ctr. (United States)
Richard Wesenberg, NASA Goddard Space Flight Ctr. (United States)
Suzanne Vennerstrom, DTU Space (Denmark)
Bernd Heber, Christian Albrecht Univ. (Germany)

Published in SPIE Proceedings Vol. 8148:
Solar Physics and Space Weather Instrumentation IV
Silvano Fineschi; Judy Fennelly, Editor(s)

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