A Walén test of low-frequency MHD waves in the magnetosheath observed by Geotail

Details A Walén test of low-frequency MHD waves in the magnetosheath observed by Geotail A Walén test of low-frequency MHD waves in the magnetosheath observed by Geotail

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002p%26ss...50..613m&link_type=abstract

Planetary and Space Science, Volume 50, Issue 5-6, p. 613-618.

Computer Science

2

Scientific paper

Data measured in the magnetosheath by the Geotail satellite are used to test for the existence of a proportional relation between the temporal changes in magnetic field, /ΔB, and the temporal changes in plasma velocity, /ΔV. We have compared the ratio /|ΔV/ΔB| with that which would be anticipated from magneto-hydrodynamic wave theory. When the plasma's /β exceeds 1, the ratio often significantly differs from that expected from any wave mode in isotropic plasmas. The existence of anisotropies in plasma distribution functions and consequent modifications of /|ΔV/ΔB| is strongly suggested. Under the assumption that the modifications of /|ΔV/ΔB| are predominantly caused by such temperature anisotropies, β||/β⊥ is evaluated over the range from 1 to 3. These anisotropies of plasma temperature may be caused by the adiabatic expansion of magnetic flux tubes in the magnetosheath.

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