Origin of Rapid Blueshifted Events in Coronal Holes
Abstract
Clusters of photospheric bright points are surrounded by chromospheric rosette-like structures. These rosettes, when observed in the far off-band (-0.1nm) Halpha images often appear to consist of short living, narrow rapid blueshifted events (RBEs). RBEs, in turn, are thought to be disk counterparts of type II spicules (spicules II), detected in Hinode data, which may be playing play an important role in coronal heating since they are thought to supply mass to the solar corona. The search for the origin of type II spicules was one of the main focus of solar physics research in the recent years.
Here we present our findings on the possible driving mechanism of spicules II, which are based on high resolution photospheric, chromospheric and magnetic field data from the New Solar Telescope (NST) collected in a coronal hole. We report that the majority of RBEs, occurring around a network cluster, are associated with appearance of opposite polarity features within the unipolar cluster fields, suggesting that magnetic reconnection may be the driving mechanism. We will present these observations in details and discuss possible implications.- Publication:
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American Astronomical Society Meeting Abstracts #220
- Pub Date:
- May 2012
- Bibcode:
- 2012AAS...22042304Y