A mechanism for the formation of knots, kinks and disconnection events in the plasma tail of comets

Details A mechanism for the formation of knots, kinks and disconnection events in the plasma tail of comets A mechanism for the formation of knots, kinks and disconnection events in the plasma tail of comets

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..521w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 521-530. NNSFC-supported research.

Statistics

Computation

2

Comet Tails, Computational Astrophysics, Cosmic Plasma, Interstellar Magnetic Fields, Magnetic Field Configurations, Magnetohydrodynamic Flow, Plasma Density, Comets, Disconnections, Plasma, Comet Tails, Plasma Sheet, Formation, Stability, Magnetic Effects, Velocity, Features, Origin, Flow, Shear, Hydromagnetics, Calculations, Astronomy, Magnetic Field, Structure

Scientific paper

The growth rates and eigenmodes of the streaming sausage, kink and tearing instabilities in the plasma tail of comets are investigated. The results show that both the sausage and kink modes can be excited by the sheared plasma flow, which is low at the center of the plasma sheet and high on the two sides of the plasma sheet. The streaming sausage mode grows faster than the streaming kink mode when beta(L) is below 1.5. When beta(L) is above 1.5, the streaming kink instability has a higher growth rate. In the presence of a finite resistivity, the streaming sausage mode evolves into the streaming tearing mode, which leads to the formation of magnetic islands. Some of the knots, kinks and disconnection events observed in the plasma tail of comets may be associated with the streaming sausage, kink and tearing instabilities, respectively.

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