The expansion of magnetic clouds

Details The expansion of magnetic clouds The expansion of magnetic clouds

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sici.symp...32s&link_type=abstract

In Alabama Univ., Huntsville. STIP Symposium on Physical Interpretation of Solar/Interplanetary and Cometary Intervals p 32 (SEE

Other

Expansion, Interplanetary Medium, Intervals, Magnetic Clouds, Magnetic Fields, Plasma Clouds, Beta Factor, Distortion, Geometry, Magnetohydrodynamic Stability, Plasma Acceleration, Plasma Pinch, Solar Corona, Stellar Mass Ejection

Scientific paper

Magnetic clouds are a carefully defined subclass of all interplanetary signatures of coronal mass ejections whose geometry is thought to be that of a cylinder embedded in a plane. It has been found that the total magnetic pressure inside the clouds is higher than the ion pressure outside, and that the clouds are expanding at 1 AU at about half the local Alfven speed. The geometry of the clouds is such that even though the magnetic pressure inside is larger than the total pressure outside, expansion will not occur because the pressure is balanced by magnetic tension - the pinch effect. The evidence for expansion of clouds at 1 AU is nevertheless quite strong so another reason for its existence must be found. It is demonstrated that the observations can be reproduced by taking into account the effects of geometrical distortion of the low plasma beta clouds as they move away from the Sun.

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