On steady field-aligned double-adiabatic flow

Details On steady field-aligned double-adiabatic flow On steady field-aligned double-adiabatic flow

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712015s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,015-12,028.

Other

20

Adiabatic Flow, Field Aligned Currents, Magnetohydrodynamic Flow, Magnetopause, Space Plasmas, Steady Flow, Flux Transfer Events, Magnetic Flux

Scientific paper

The paper summarizes the four general double-adiabatic invariants governing ideal MHD flow in a narrow tube and renders them in a form suitable for the calculation of flow in tubes of nonconstant cross-sectional area. Results for converging-diverging flux tubes are developed and compared to single-adiabatic results which are identical to those for ordinary gasdynamic flow. It is found that in certain parameter regimes the governing equation for the vector potential is elliptic and can be reduced to Laplace's equation by simple stretching of one coordinate. In other regimes the equation is hyperbolic, indicating the presence of wave patterns. The relevance of these results to flow over magnetopause undulations, including flux transfer events, is discussed.

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