Large-Scale and Long-Lived Coronal Structures Detected in Limb Synoptic Maps

Details Large-Scale and Long-Lived Coronal Structures Detected in Limb Synoptic Maps Large-Scale and Long-Lived Coronal Structures Detected in Limb Synoptic Maps

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..333l&link_type=abstract

Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc

Physics

Scientific paper

The presentation will summarize our recent work on the large-scale, long-lived coronal streamers based on limb synoptic maps made from Yohkoh/SXT and SOHO/EIT images. The number of properties of such coronal streamers have been revealed on the limb synoptic maps: 1. They originate from active regions and have large extent in both latitude and altitude. 2. Because they are large in 3-dimension, they largely control the visibility of polar hole regions. When the active region is in close side of the sun, then may cover the polar holes. When the active region is at far side of the sun, they can be seen above the solar limb by projections; 3. The life time of such large-scaled coronal streamers can be up to 10 solar rotations; 4. These structures are associated with underlying, non-contemporaneous spot clusters; 5. Individual spots in the clusters are short-lived, but contribute magnetic flux collectively to form the long-lived coronal features.

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