Earth-Affecting Solar Causes Observatory (EASCO): A potential International Living with a Star Mission from Sun–Earth L5

This paper describes the scientific rationale for an L5 mission and a partial list of key scientific instruments the mission should carry. The L5 vantage point provides an unprecedented view of the solar disturbances and their solar sources that can greatly advance the science behind space weather....

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Bibliographic Details
Published in:Journal of atmospheric and solar-terrestrial physics 2011-04, Vol.73 (5), p.658-663
Main Authors: Gopalswamy, N., Davila, J.M., St. Cyr, O.C., Sittler, E.C., Auchère, F., Duvall, T.L., Hoeksema, J.T., Maksimovic, M., MacDowall, R.J., Szabo, A., Collier, M.R.
Format: Article
Language:English
Subjects:
Astrophysics
Atmospherics
Coronal mass ejections
Corotating interaction regions
Doppler effect
Earth, ocean, space
Earth–Sun L5
Exact sciences and technology
External geophysics
Geomagnetic storms
Imaging
Missions
Physics
Physics of the ionosphere
Physics of the magnetosphere
Radio bursts
Solar energetic particles
Solar wind
Space weather
White light
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Summary:This paper describes the scientific rationale for an L5 mission and a partial list of key scientific instruments the mission should carry. The L5 vantage point provides an unprecedented view of the solar disturbances and their solar sources that can greatly advance the science behind space weather. A coronagraph and a heliospheric imager at L5 will be able to view CMEs broadsided, so space speed of the Earth-directed CMEs can be measured accurately and their radial structure discerned. In addition, an inner coronal imager and a magnetograph from L5 can give advance information on active regions and coronal holes that will soon rotate on to the solar disk. Radio remote sensing at low frequencies can provide information on shock-driving CMEs, the most dangerous of all CMEs. Coordinated helioseismic measurements from the Sun–Earth line and L5 provide information on the physical conditions at the base of the convection zone, where solar magnetism originates. Finally, in situ measurements at L5 can provide information on the large-scale solar wind structures (corotating interaction regions (CIRs)) heading towards Earth that potentially result in adverse space weather. ► Scientific rationale for remote-sensing and in-situ instruments from Sun–Earth L5. ► Imaging coronal mass ejections (white light) and their solar sources (EUV). ► Obtaining magnetograms and Dopplergrams using a Magnetic and Doppler imager. ► Measuring solar wind plasma and magnetic field in corotating interaction regions. ► Detecting energetic particles and radio bursts originating in interplanetary shocks.
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2011.01.013