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›› 2005, Vol. 22 ›› Issue (2): 248-254.DOI: 10.7523/j.issn.2095-6134.2005.2.019

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Comprehensive Studies on Magnetic Clouds in Interplanetary Space and their Associated Events

WANG Yu-Ming, WANG Shui   

  1. School of Earth and Space Sciences, University of Science and Technology of Chi na, Hefei 230026, China
  • Received:2004-04-19 Online:2005-03-15

Abstract:

The relationships between the coronal mass ejections (CMEs), interplanetary disturbances and geomagnetic storms are studied, involving the solar source distribution of geoeffective halo CMEs, the periodicity of CMEs, X-ray flares and geomagnetic disturbances, the threshold of interplanetary parameters in causing geomagnetic storms, etc. As a kind of interplanetary complex structure, multiple magnetic cloud (Multi-MC) is proposed for the first time, which probably has strong geoeffectiveness.Based on the observations, some primary characteristics of Multi-MC are summarized. Moreover, the phenomenon of a shock advancing into a preceding magnetic cloud has been investigated as well as its potential geoeffectiveness. A simple theoretical model is developed to estimate the intensity of geomagnetic storm when a shock is entering a preceding cloud.

Key words: coronal mass ejection, magnetic cloud, geomagnetic storm, shock, interplanetary medium

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