Physics
Scientific paper
May 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26..581w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 5, pp. 581-602
Physics
1
Scientific paper
The object of this paper is to consider the disturbance propagated in the magnetosphere when the particle flux in the solar wind changes abruptly. To simplify the analysis only a plane model is considered. It is assumed that the geomagnetic field is terminated at a certain distance by the particle pressure of the solar wind, as in the theories of Chapman and Ferraro, Dessler, and Parker. An abrupt increase of particle density in the stream will produce an abrupt increase in the dynamical pressure on the stationary front surface of the solar wind, which will tend to push forward the magnetic tubes of force still further. Because of the magnetic elasticity of the magnetosphere a magnetic disturbance will arise which will be propagated, even in a linearized theory, as a succession of discontinuities and for small increases in particle density the speed of propagation is the local Alfvén speed. The final equilibrium position of the stream surface is considered quite generally and numerical estimates are obtained for the final value of the disturbance magnetic field.
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