On the existence of the ion tearing mode

Details On the existence of the ion tearing mode On the existence of the ion tearing mode

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981plap.rept..383g&link_type=abstract

In ESA Plasma Astrophys. p 383-384 (SEE N82-20030 10-88)

Astronomy and Astrophysics

Astrophysics

Magnetic Storms, Magnetospheric Instability, Tearing Modes (Plasmas), Energy Methods, Larmor Radius, Magnetic Field Configurations, Sudden Storm Commencements, Vlasov Equations

Scientific paper

An ion tearing mode is suggested as a possible onset mechanism for magnetospheric substorms. Earlier work, based on a WKB approximation where the wavelength of the mode along the tail had to be restricted to values much smaller than the characteristic length for magnetic field variation in that direction, indicated that the ion tearing instability may not exist in the magnetotail. In the present theory the WKB method is abandoned and the exact energy principle for the (two-dimensional) Vlasov theory is used instead. The tail equilibrium is represented by two-dimensional self-consistent solutions. The computed minimizing modes have the shape of tearing modes. The characteristic length is by order of magnitude the length scale for the magnetic field variation. Results show that the ion tearing instability does in fact occur in the long wavelength regime and therefore is a possible onset mechanism.

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