Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0602y&link_type=abstract
American Astronomical Society, SPD meeting #42, #6.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Optics
Scientific paper
The largest ground-based solar telescope, the new solar telescope (NST) of Big Bear Solar Observatory now allows us to address many important issues of coupling between the photosphere and chromosphere by means of simultaneous observations of photospheric granulation with well resolved bright points (BPs) and associated dynamics in the low chromosphere, as seen in H-alpha spectral line. Excellent seeing conditions, augmented with an adaptive optics system and speckle-reconstruction applications produce diffraction limited images. We use these data to search for any possible connection between typical dynamics of bright points (collision, clustering and rapid motions) and chromospheric activity, such as jets that are visible on all scales down to the smallest resolved features. In this presentation we will highlight the most important findings, which include the following. 1) In mostly unipolar coronal holes, the majority of colliding/interacting BPs are not associated with any detectable chromospheric activity. This means that the component reconnection, presumably occurring when the same polarity BPs interact, may not be very effective in producing chromospheric flows. We speculate that interaction of opposite polarity BPs may be more effective in generating up-flows. 2) NST/TiO images further reveal the hidden structure of plasma vortex tubes, previously predicted by Steiner et al. Besides the bright granular lane, a vortex tube structure also includes rapidly developing bright grain co-spatial with the tube's axis. Finally, some vortex tube events, detected in a CH data set, are co-spatial with small-scale chromospheric jets, which suggests that they may be associated with new magnetic flux emerging within a granule.
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