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(Left) SOHO-EIT 195 Å image from 27 January 2000, showing a huge coronal hole. (Right) Interplanetary parameters from the ACE spacecraft (from top to bottom: magnetic field strength and z-GSM component, and solar wind velocity and temperature) and Dst index from Kyoto showing the fast stream from the coronal hole shown in the EIT image. The Dst index remains disturbed for more than 5 days.
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