Magnetic clouds and the pinch effect

Details Magnetic clouds and the pinch effect Magnetic clouds and the pinch effect

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5437s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5437-5445. NASA-supported research.

Physics

35

Plasma Clouds, Plasma Pinch, Magnetic Effects, Magnetic Field Configurations, Magnetic Flux, Plasma Cylinders, Pressure Effects

Scientific paper

Pinch models that reproduce the observed properties of magnetic clouds are presented. It is shown that magnetic tension can be significant in magnetic clouds and that, despite claims to the contrary, magnetic clouds are not expanding due to magnetic overpressure, because the magnetic-pressure imbalance can be counteracted by magnetic tension (pinch effect). Nevertheless, the source of the observed cloud expansion is considered to be the relatively strong magnetic field in clouds. It is shown that magnetic clouds, as they are advected away from the sun, retain their equilibrium shape because of their strong fields. Retaining pressure equilibrium with their surroundings means that the front and back edges of clouds must move apart, giving the appearance in the data that clouds are expanding globally.

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