Physics – Optics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21012002r&link_type=abstract
American Astronomical Society Meeting 210, #120.02; Bulletin of the American Astronomical Society, Vol. 39, p.245
Physics
Optics
Scientific paper
We present high resolution observations of the complex active region AR0484 observed close to disk center at the Dunn Solar Telescope. The field of view contains several interesting features including a number of umbral fragments, light bridges of varying width, umbral dots and dark-cored penumbral filaments. A time sequence of reconstructed g-band images and adaptive optics corrected UBF filtergrams were analyzed with the goal to compare observations with recent model predictions for sunspot fine-structure. In an umbral fragment where the field strength is relatively weak we find a large number of umbral dots. We were able to resolve substructure within umbral dots that in some cases resembles the dark lanes recently predicted by MHD simulations by Schuessler and Voegler 2006. Umbral dot substructure is also clearly revealed in images of spectral line parameters. We compare line parameters for dark-cored penumbral filaments, dark lanes observed in light bridges and the umbral dot substructure. We observe dynamic proper motion of umbral dots, including motion along a narrow lane that occurs within an umbral fragment and shows similarity to the proper motion observed in narrow light bridges. Furthermore, we study the temporal variation of spectral line parameters such as the integrated line absorption of the temperature sensitive FeI 5434 A line.
No associations
LandOfFree
On The Relation Between Umbral Dots, Dark-cored Filaments And Light Bridges does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On The Relation Between Umbral Dots, Dark-cored Filaments And Light Bridges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On The Relation Between Umbral Dots, Dark-cored Filaments And Light Bridges will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1034903