Global Coronal Mass Ejections

Details Global Coronal Mass Ejections Global Coronal Mass Ejections

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...664l.131z&link_type=abstract

The Astrophysical Journal, Volume 664, Issue 2, pp. L131-L134.

Astronomy and Astrophysics

Astronomy

18

Sun: Corona, Sun: Coronal Mass Ejections (Cmes)

Scientific paper

Observations of the low solar corona in the extreme ultraviolet and in soft X-rays evidence a close relationship of coronal dimmings and coronal mass ejections (CMEs). Dimmings are usually interpreted as places of plasma evacuation during a CME. We characterize a CME by the apparent angular extent of associated dimmings above the solar limb and define a global CME as a CME with the total apparent extent of limb dimmings of more than 180°. Several examples of global CMEs are discussed. All the global CMEs identified up to now are fast full-halo CMEs associated with X-class flares (if they originate on the front side of the Sun). We demonstrate that global CMEs involve an eruption of several magnetic flux systems distributed on a large spatial scale comparable to one-half of the solar disk (true angular width around 180°). We discuss possible interpretations of the global CME phenomenon and challenges it presents to CME modeling. Our results suggest a nonlocal nature of the CME eruption mechanism.

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