Magnetospheric response to extreme solar events of January 2005, as observed by the Cluster and Double Star spacecraft

Details Magnetospheric response to extreme solar events of January 2005, as observed by the Cluster and Double Star spacecraft Magnetospheric response to extreme solar events of January 2005, as observed by the Cluster and Double Star spacecraft

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm51a..03v&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM51A-03

Physics

2784 Solar Wind/Magnetosphere Interactions

Scientific paper

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.

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