Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-26
Astronomy and Astrophysics
Astrophysics
16 pages, 8 figures
Scientific paper
10.1086/521217
We compare the rms contrast in observed speckle reconstructed G-band images with synthetic filtergrams computed from two magneto-hydrodynamic simulation snapshots. The observations consist of 103 bursts of 80 frames each taken at the Dunn Solar Telescope (DST), sampled at twice the diffraction limit of the telescope. The speckle reconstructions account for the performance of the Adaptive Optics (AO) system at the DST to supply reliable photometry. We find a considerable discrepancy in the observed rms contrast of 14.1% for the best reconstructed images, and the synthetic rms contrast of 21.5% in a simulation snapshot thought to be representative of the quiet Sun. The areas of features in the synthetic filtergrams that have positive or negative contrast beyond the minimum and maximum values in the reconstructed images have spatial scales that should be resolved. This leads us to conclude that there are fundamental differences in the rms G-band contrast between observed and computed filtergrams. On the basis of the substantially reduced granular contrast of 16.3% in the synthetic plage filtergram we speculate that the quiet-Sun may contain more weak magnetic field than previously thought.
Rimmele Thomas
Tritschler Alexandra
Uitenbroek Han
No associations
LandOfFree
The discrepancy in G-band contrast: Where is the quiet Sun? 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 The discrepancy in G-band contrast: Where is the quiet Sun?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The discrepancy in G-band contrast: Where is the quiet Sun? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-676720