Quiet-Sun intensity contrasts in the near ultraviolet
Abstract
We present high-resolution images of the Sun in the near ultraviolet spectral range between 214 nm and 397 nm as obtained from the first science flight of the 1-m Sunrise balloon-borne solar telescope. The quiet-Sun rms intensity contrasts found in this wavelength range are among the highest values ever obtained for quiet-Sun solar surface structures - up to 32.8% at a wavelength of 214 nm. We compare with theoretical intensity contrasts obtained from numerical magneto-hydrodynamic simulations. For 388 nm and 312 nm the observations agree well with the numerical simulations whereas at shorter wavelengths discrepancies between observed and simulated contrasts remain.
- Publication:
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arXiv e-prints
- Pub Date:
- September 2010
- DOI:
- 10.48550/arXiv.1009.1050
- arXiv:
- arXiv:1009.1050
- Bibcode:
- 2010arXiv1009.1050H
- Keywords:
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- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 6 pages, 4 figures, accepted by ApJL