AbstractUsing a serendipitous configuration of the ACE and Wind spacecraft, we monitor the response of the distant geomagnetic tail (∼−220 R E ) to an abrupt, approx. fivefold pressure drop (from ∼19.0 to ∼3.5nPa) at the front boundary of a magnetic cloud (MC) on November 20, 2003. The interplanetary data are from ACE in orbit around the L1 point. The far-tail observations are from Wind, which was nominally in the magnetosheath, separated from the Sun–Earth line by 40 R E . The magnetic field in the innermost sheath region of the MC had a large B y ( 30 nT ) and substantial and variable flows lateral to the Sun–Earth line. There was also a significant northward field (∼35nT), unique in the vicinity of this MC. These extreme values are reached in a filament forming the earliest relic of material accreted by the MC en route to Earth. The effects resulting from these on the far geomagnetic tail are: (1) expansion, (2) tail twisting, and (3) tail tilting. These extreme conditions were in part responsible for a crossing by Wind of a neutral sheet which is tilted by ∼85° to the ecliptic. Further, Wind made two successive excursions deep into the geomagnetic tail, in the first of which a tailward flow burst of ∼1200km/s was observed. The dayside part of the interaction of the sudden and large dynamic pressure drop with the bow shock is studied with a local 3D MHD simulation. This work is a contribution to the area ICME/MC-sheaths–magnetosheath interactions.


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    Titel :

    Effects on the distant geomagnetic tail of a fivefold density drop in the inner sheath region of a magnetic cloud: A joint Wind–ACE study


    Beteiligte:
    Farrugia, C.J. (Autor:in) / Erkaev, N.V. (Autor:in) / Maynard, N.C. (Autor:in) / Richardson, I.G. (Autor:in) / Sandholt, P.E. (Autor:in) / Langmayr, D. (Autor:in) / Ogilvie, K.W. (Autor:in) / Szabo, A. (Autor:in) / Taubenschuss, U. (Autor:in) / Torbert, R.B. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 44 , 11 ; 1288-1294


    Erscheinungsdatum :

    2009-07-04


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch