Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11b0428h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM11B-0428
Physics
2728 Magnetosheath, 7871 Waves And Instabilities, 7894 Instruments And Techniques
Scientific paper
Using magnetic field data from the four Cluster spacecraft, we present estimates of the size, shape and orientation of mirror mode structures in the terrestrial magnetosheath. Timing analysis of individual magnetic depressions can be used to estimate their orientation, and we show, using CIS measurements, that they are not moving at a significant speed relative to the local plasma. By considering differences between structures at the four spacecraft, on both a single event and statistical basis, it is possible to estimate their size and shape. We show that the direction in which the structures are of largest extent is often significantly different from the local magnetic field vector, and that the structures vary widely in total size, from a few hundred to a few thousand km. We also discuss the variation in size of the mirror modes in different directions, demonstrating that they are often significantly shorter parallel to the local magnetopause normal, consistent with their being compressed against the magnetopause.
Balogh André
Dandouras Iannis
Horbury Tim S.
Lucek Elisabeth A.
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