Role of Small-Scale Brightenings in On-Disk Coronal Hole Evolution

Details Role of Small-Scale Brightenings in On-Disk Coronal Hole Evolution Role of Small-Scale Brightenings in On-Disk Coronal Hole Evolution

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1826f&link_type=abstract

American Astronomical Society, SPD meeting #42, #18.26; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

In this study, we investigate the properties of small-scale brightenings that occur in and near the boundary of an on-disk coronal hole using an automatic detection algorithm. Previously, attempts to explain the quasi-rigid rotation of on-disk CH's by small-scale reconnections at the boundary have been observationally limited. Using SDO/AIA 171,193 and SDO/HMI high cadence observations, we attempt to re-examine the role small-scale brightenings may have in the evolution of on-disk CHs. We examine spatial and temporal evolution, intensity, distribution within the CH, correlation to magnetic activity, and correspondence to the distribution of the 'squashing factor', Q. We present the preliminary results of our study and discuss implications for CH boundary theories.

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