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Dispersive ducting of MHD waves in the plasma sheet - A source of Pi2 wave bursts (1986)

Roberts, B. ; Edwin, P. M. ; Hughes, W. J.

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Publication Date: 2019-07-12

Description: Fast magnetoacoustic waves can be ducted by plasma inhomogeneities such as the plasma sheet. As this ducting is dispersive an impulsive source will give rise to a well-defined, quasi-periodic wave packet with time-scales determined by the width of the inhomogeneity and characteristic speeds in the wave duct and surrounding medium. The duration of the wave packet depends upon the distance from the source. It is argued that an impulsive source in the plasma sheet at substorm onset will produce a wave packet near earth with characteristics similar to pi2 wave bursts and put this idea forward as a mechanism for the generation of pi2 pulsations.

Keywords: GEOPHYSICS

Type: Geophysical Research Letters (ISSN 0094-8276); 13; 373-376

Format: text

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