On the existence of purely transverse field-line oscillations

Details On the existence of purely transverse field-line oscillations On the existence of purely transverse field-line oscillations

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1857r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1857-1860. Research supported by the Johns Hopkins Univers

Physics

3

Earth Magnetosphere, Magnetic Field Configurations, Plasma Oscillations, Space Plasmas, Hall Effect, Larmor Radius, Toroidal Plasmas, Transverse Oscillation

Scientific paper

It is shown that transverse toroidal (or poloidal) oscillations are possible in a dipole field, provided they are sufficiently localized in radial (azimuthal) direction for the Hall current-generated electric fields to be relevant. Explicit solutions are obtained for azimuthal oscillations and it is shown that these are localized in the radial direction with an exponential decay length L0 omega/k omega(ci) in the equatorial plane; where L0 is the equatorial distance of the field line; omega and omega(ci) are field line resonance and ion cyclotron frequencies, and k is the zonal wave number of the mode. It is also shown that a superposition of a continuum of such structures centered over a range of L values can generate the fluctuations that are observed.

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