Discrete changes in solar coronal hole boundaries

Details Discrete changes in solar coronal hole boundaries Discrete changes in solar coronal hole boundaries

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362..728k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 20, 1990, p. 728-733.

Astronomy and Astrophysics

Astrophysics

20

Coronal Holes, Magnetic Field Reconnection, Solar Corona, Solar Magnetic Field, Helioseismology, Magnetohydrodynamics, Temporal Distribution, Temporal Resolution, X Ray Imagery

Scientific paper

Sequences of Skylab X-ray images near central meridian passages of a large solar coronal hole are used here to examine hole boundary changes with a time resolution of 90 min. It is found that X-ray bright points play a key role in both the expansion and contraction of the coronal hole. The size scale of the boundary changes is about 20,000 km, and the time scale is 3 hr or less. A scenario is suggested in which a large-scale closed magnetic field interacts with a bright point to effect a change in the hole boundary.

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