Transition-Region Blinkers - II. Active-Region Properties

Details Transition-Region Blinkers - II. Active-Region Properties Transition-Region Blinkers - II. Active-Region Properties

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002soph..206..249p&link_type=abstract

Solar Physics, v. 206, Issue 2, p. 249-271 (2002).

Physics

23

Scientific paper

The distribution and general properties of events identified in an active region that have the same characteristics as quiet-Sun blinkers are discussed and named `active-region blinkers'. The events are identified using an automated scheme `BLinker Identification Program' (BLIP) which was designed for and tested on quiet-Sun blinkers. Like quiet-Sun blinkers, the active-region events are most easily identified in the 629 Å emission line from Ov although evidence for them is also found in other extreme UV lines emitted from Hei, Oiii and Oiv. Unlike quiet-Sun blinkers, however, they may also have coronal signatures in the lines Mgix and Mgx. Their properties are very similar to those of quiet-Sun blinkers with mean lifetimes of 16-19 min, mean areas of 2.4-4.3×10^7 km^2 and mean intensity enhancements factors of 1.8-3.3. Their global frequency of 7-28 s^-1 is about 42%-700% higher than that for quiet-Sun blinkers. The blinkers discussed here are found above both active-region (plage) magnetic fields, as well as above the umbra and penumbra of a sunspot.

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