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First imaging of corotating interaction regions using the STEREO spacecraft

Research output: Contribution to journalJournal article


  • A. P. Rouillard
  • J. A. Davies
  • R. J. Forsyth
  • A. Rees
  • C. J. Davis
  • R. A. Harrison
  • M. Lockwood
  • D. Bewsher
  • S. R. Crothers
  • C. J. Eyles
  • M. Hapgood
  • C. H. Perry
Article numberL10110
Journal publication date31/05/2008
JournalGeophysical Research Letters
Number of pages4
Original languageEnglish


Plasma parcels are observed propagating from the Sun out to the large coronal heights monitored by the Heliospheric Imagers (HI) instruments onboard the NASA STEREO spacecraft during September 2007. The source region of these out-flowing parcels is found to corotate with the Sun and to be rooted near the western boundary of an equatorial coronal hole. These plasma enhancements evolve during their propagation through the HI cameras' fields of view and only becoming fully developed in the outer camera field of view. We provide evidence that HI is observing the formation of a Corotating Interaction Region (CIR) where fast solar wind from the equatorial coronal hole is interacting with the slow solar wind of the streamer belt located on the western edge of that coronal hole. A dense plasma parcel is also observed near the footpoint of the observed CIR at a distance less than 0.1AU from the Sun where fast wind would have not had time to catch up slow wind. We suggest that this low-lying plasma enhancement is a plasma parcel which has been disconnected from a helmet streamer and subsequently becomes embedded inside the corotating interaction region.

Bibliographic note

Copyright 2008 by the American Geophysical Union