HR: 0830h
AN: SM51A-03    [Abstracts]
TI: Magnetospheric response to extreme solar events of January 2005, as observed by the Cluster and Double Star spacecraft
AU: * Vallat, c
EM: vallat@cesr.fr
AF: CESR/CNRS, 9 avenue du colonel Roche BP 4346, Toulouse, 31028 France
AU: Dandouras, I
EM: dandouras@cesr.fr
AF: CESR/CNRS, 9 avenue du colonel Roche BP 4346, Toulouse, 31028 France
AU: Escoubet, P
EM: Philippe.Escoubet@esa.int
AF: ESTES/ESA, Postbus 299, Keplerlaan, 1,, Noordwijk, 2200 AG Netherlands
AU: RŠme, H
EM: reme@cesr.fr
AF: CESR/CNRS, 9 avenue du colonel Roche BP 4346, Toulouse, 31028 France
AU: Cao, J
EM: jbcao@center.cssar.ac.cn
AF: Center of Space Science and Applied Research, PO Box 8701, Beijing, 100080 China
AU: Balogh, A
EM: a.balogh@ic.ac.uk
AF: Blackett Laboratory/Imperial College, Prince Consort Road, London, SW7 2BZ United Kingdom
AU: Carr, C
EM: C.M.Carr@ic.ac.uk
AF: Blackett Laboratory/Imperial College, Prince Consort Road, London, SW7 2BZ United Kingdom
AB: Extreme solar events can drive extraordinary responses of the terrestrial magnetosphere, characterised by strong deformations of the magnetic field and the plasma populations. Magnetospheric changes following extreme solar events of January 2005 have been analysed using particle data obtained with the Cluster and Double Star missions. The 17 January 2005 event was characterised by the arrival of an interplanetary cloud of solar energetic particles at the Earth orbit. The Double Star (TC - 1) spacecraft was situated in the Magnetosheath and detected a sudden Magnetosheath compression (increased density and temperature), whereas the Cluster spacecraft constellation, situated in the Solar wind, recorded a substantial increase of the particle flux at all energy ranges, characteristic of background provoked by the presence of penetrating particles. Four days later, on the 21 of January, Cluster and Double Star were both situated in the afternoon sector when they recorded the huge increase of solar wind pressure. At about 17:10 TU, Cluster, situated in the solar wind region, recorded an important increase (factor of ~4) of the proton density (CIS data), while the velocity jumped from ~ 500 to ~ 900 km.s-1. The Double Star TC-1 spacecraft, situated at the same time in the Magnetosheath on the inbound trajectory (R ~ 9 RE) crossed the bow shock at 18:53 UT and stayed in the solar wind for 14 minutes, due to the sudden compression before re-entering in the Magnetosheath (R < 8.5 RE). An analysis of the Magnetospheric modifications induced by these solar events, as recorded by the Cluster and Double Star spacecraft, will be presented.
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly