Properties of slow magnetic clouds

Details Properties of slow magnetic clouds Properties of slow magnetic clouds

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..147t&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 2, p. 147-151.

Physics

10

Slow Magnetic Clouds, Geoeffectiveness, Interplanetary Magnetic Fields

Scientific paper

Slow (VSW<400kms-1) magnetic clouds have been analyzed to determine their characteristics and geoeffectiveness. It is found that slow clouds have mean magnetic field strengths of ~13nT, peak BS~9nT, and dawn-dusk electric fields of ESW~2.5mVm-1. The clouds are small in spatial size, typically ~0.18AU. The slowest events may have been accelerated to their speeds by interaction with the slow solar wind. Slow clouds are surprisingly geoeffective. Five out of 27 events caused major (DST<=-100nT) magnetic storms. Likewise, these geoeffective clouds may have been decelerated to VSW<400kms-1. The issue of interplanetary acceleration/deceleration will be examined with SOHO coronal mass ejection data in the near future.

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