Interplanetary magnetic clouds at 1 AU

Details Interplanetary magnetic clouds at 1 AU Interplanetary magnetic clouds at 1 AU

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8128394k&link_type=abstract

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Computer Science

1

Ejecta, Interplanetary Magnetic Fields, Magnetic Clouds, Magnetic Field Configurations, Coronal Loops, Cosmic Gases, Solar Flares, Stellar Mass Ejection

Scientific paper

Magnetic clouds are defined as regions with a radial dimension approximately 0.25 AU (at 1 AU) in which the magnetic field strength is high and the magnetic field direction changes appreciably by means of rotation of one component of B nearly parallel to a plane. The magnetic field geometry in such a magnetic cloud is consistent with that of a magnetic loop, but it cannot be determined uniquely. Forty-five clouds were identified in interplanetary data obtained near Earth between 1967 and 1978; at least one cloud passed the Earth every three months. Three classes of clouds were identified, corresponding to the association of a cloud with a shock, a stream interface, or a CME. There are approximately equal numbers of clouds in each class, and the three types of clouds might be different manifestations of a coronal transient. The magnetic pressure inside the clouds is higher than the ion pressure and the sum is higher than the pressure of the material outside of the cloud.

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