Vorticity in the magnetosphere

Details Vorticity in the magnetosphere Vorticity in the magnetosphere

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1703k&link_type=abstract

Planetary and Space Science, vol. 22, Dec. 1974, p. 1703-1709.

Physics

Birkeland Currents, Current Sheets, Ionospheric Currents, Magnetospheric Instability, Vorticity, Equations Of Motion, Lower Ionosphere, Magnetohydrodynamic Flow, Plasma Dynamics, Shear Flow, Velocity Distribution

Scientific paper

It is shown that Birkeland current and vorticity in the magnetosphere are intimately related, suggesting the importance of taking explicit account of vorticity, particularly velocity shear, when considering magnetospheric motions. An equation of motion for the magnetosphere coupled to the ionosphere is derived. It is suggested that experience with MHD fluids generally might fruitfully be brought to bear on certain problems in the magnetosphere to answer the question, not 'why a sheet of Birkeland current,' but rather 'why a localized velocity shear'.

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