Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..362n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. 362-364.
Astronomy and Astrophysics
Astrophysics
1
Comet Tails, Magnetohydrodynamic Stability, Solar Wind, Space Plasmas, Astronomical Models, Flares, Magnetic Flux, Comets, Comet Tails, Plasma, Magnetohydrodynamics, Flares, Pressure, Models, Ionopause, Solar Wind, Magnetic Fields, Flux, Diagrams
Scientific paper
The hypersonic pressure balance model of flaring in cometary plasma tails of Ershkovich et al. (1982) has been modified to include the effects of magnetohydrodynamic (MHD) instabilities occurring along the ionopause in the outer-tail regions. The effect of instability is to mix the solar-wind and comet-tail plasmas, increasing the tail magnetic field strength above that calculated from magnetic flux conservation. The earlier model assumed the ionopause to be a tangential discontinuity surface (flux conserving) at all distances, with the result that the magnetic field approached zero in the outer regions of strongly flaring tails. The present model is more realistic and is in better agreement with measurements of cometary plasma tail widths and flaring angles. This agreement leads to an important conclusion that the magnetic flux is not conserved in distant comet tails.
Brandt Jack C.
Ershkovich A. I.
Niedner Mal B.
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