Instant: An Innovative L5 Small Mission Concept for Coordinated Science with Solar Orbiter and Solar Probe Plus

Tuesday, 16 December 2014
Benoit Lavraud1, Ying D. Liu2, Richard Anthony Harrison3, William Liu2, Frederic Auchere4, Weiqun Gan5, Philippe L Lamy6, Lidong Xia7, Jonathan P Eastwood8, R F Wimmer-Schweingruber9, Qiugang Zong10, Pierre Rochus11, Milan Maksimovic12, Manuela Temmer13, C Philippe Escoubet14, Emilia Kilpua15, Alexis P Rouillard16, Jackie A Davies17, Jean-Claude Vial4, Nat Gopalswamy18, Stuart D Bale19, Gang Li20, Timothy A Howard21 and Craig E DeForest22, (1)IRAP, Toulouse, France, (2)NSSC National Space Science Center, CAS, Beijing, China, (3)Rutherford Appleton Laboratory, Didcot, OX11, United Kingdom, (4)IAS Institut d'Astrophysique Spatiale, Orsay Cedex, France, (5)Purple Mountain Observatory, Nanjing, China, (6)Lab Astrophysique Marseille, Marseilles Cedex 13, France, (7)Shandong Univ. at Weihai, Weihai, China, (8)Imperial College London, London, United Kingdom, (9)University of Kiel, Kiel, Germany, (10)Peking University, Beijing, China, (11)Centre Spatial de Liege, Liege, Belgium, (12)CNRS, Paris Cedex 16, France, (13)University of Graz, Graz, Austria, (14)ESTEC, Noordwijk, 2201, Netherlands, (15)University of Helsinki, Helsinki, Finland, (16)IRAP/CNRS, Toulouse, France, (17)Rutherford Appleton Laboratory, Didcot, United Kingdom, (18)NASA Goddard SFC, Greenbelt, MD, United States, (19)University of California Berkeley, Berkeley, CA, United States, (20)University of Alabama in Huntsville, Huntsville, AL, United States, (21)Southwest Research Institute Boulder, Boulder, CO, United States, (22)Southwest Research Institute, Boulder, CO, United States
We will present both the science objectives and related instrumentation of a small solar and heliospheric mission concept, INSTANT: INvestigation of Solar-Terrestrial Activity aNd Transients. It will be submitted as an opportunity to the upcoming ESA-China S-class mission call later this year. This concept was conceived to allow innovative measurements and unprecedented, early determination of key properties of Earthbound CMEs from the L5 vantage point. Innovative measurements will include magnetic field determination in the corona thanks to Hanle measurement in Lyman-α and polarized heliospheric imaging for accurate determination of CME trajectories. With complementary in situ measurements, it will uniquely permit solar storm science, solar storm surveillance, and synergy with Solar Orbiter and Solar Probe Plus (the ESA-China S2 mission launch is planned in 2021).