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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 12
Ann. Geophys., 29, 2219-2223, 2011
https://doi.org/10.5194/angeo-29-2219-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 2219-2223, 2011
https://doi.org/10.5194/angeo-29-2219-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 01 Dec 2011

ANGEO Communicates | 01 Dec 2011

Magnetopause displacements: the possible role of dust

R. A. Treumann1,2 and W. Baumjohann3 R. A. Treumann and W. Baumjohann
  • 1Department of Geophysics and Environmental Sciences, Munich University, Munich, Germany
  • 2Department of Physics and Astronomy, Dartmouth College, Hanover NH 03755, USA
  • 3Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Abstract. Large compressions of the magnetopause are proposed to occasionally result from temporary encounters of the magnetosphere with dust streams in interplanetary space. Such streams may have their origin in cometary dust tails or asteroids which cross the inner heliosphere or in meteoroids in Earth's vicinity. Dust ejected from such objects when embedding the magnetosphere for their limited transition time should cause substantial global deformations of the magnetopause/magnetosphere due to the very large dust grain mass and momentum which compensates for the low dust density when contributing to the upstream pressure variation.

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