SOHO/EIT data on global canalized dimmings in halo CME events

Details SOHO/EIT data on global canalized dimmings in halo CME events SOHO/EIT data on global canalized dimmings in halo CME events

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..117c&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

1

Solar Corona, Coronal Mass Ejections (Cmes), Dimmings

Scientific paper

An analysis of SOHO/EIT difference images at 195 Å, particularly for the period of 2000-2001, revealed a new variety of dimmings, or transient coronal holes, observed on the solar disk after halo-type coronal mass ejection (CMEs). In large eruptive events, along with relatively compact dimmings adjoining to an eruptive center, we have found strongly anisotropic, somewhat less contrast canalized dimmings. They extend along several narrow, lengthy structures (channels) and span a considerable sector of the visible disk. We argue that these transient features are closely associated with a strong disturbance and restructuring of large-scale magnetic fields involved in the CME process. We also argue that the canalized character of the dimmings reflects a complex topology of the global solar magnetosphere near the maximum of the solar activity cycle.

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