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Title: QUIET-SUN INTENSITY CONTRASTS IN THE NEAR-ULTRAVIOLET AS MEASURED FROM SUNRISE

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 the rms contrasts obtained from the observational data with theoretical intensity contrasts obtained from numerical magnetohydrodynamic 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.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2] ; ; ;  [3] ; ;  [4] ;  [5] ;  [6]
  1. Max-Planck-Institut fuer Sonnensystemforschung, D-37434 Katlenburg-Lindau (Germany)
  2. Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2AZ (United Kingdom)
  3. Kiepenheuer-Institut fuer Sonnenphysik, D-79104 Freiburg (Germany)
  4. Instituto de Astrofisica de Canarias, E-38200 La Laguna (Spain)
  5. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307 (United States)
  6. Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94305 (United States)
Publication Date:
OSTI Identifier:
21452695
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 723; Journal Issue: 2; Other Information: DOI: 10.1088/2041-8205/723/2/L154
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; SOLAR GRANULATION; SUN; TELESCOPES; ULTRAVIOLET RADIATION; WAVELENGTHS ELECTROMAGNETIC RADIATION; MAIN SEQUENCE STARS; RADIATIONS; SIMULATION; SOLAR ACTIVITY; STARS; STELLAR ACTIVITY