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The Wave-Front Correction System for the Sunrise Balloon-Borne Solar Observatory |
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| Authors: | T. Berkefeld W. Schmidt D. Soltau A. Bell H. P. Doerr B. Feger R. Friedlein K. Gerber F. Heidecke T. Kentischer O. v.?d. L??he M. Sigwarth E. W?lde P. Barthol W. Deutsch A. Gandorfer D. Germerott B. Grauf R. Meller A. ??lvarez-Herrero M. Kn?lker V. Mart??nez Pillet S. K. Solanki A. M. Title |
| Affiliation: | 1. Kiepenheuer-Institut f??r Sonnenphysik, Sch?neckstra?e 6, 79104, Freiburg, Germany 2. Max-Planck-Institut f??r Sonnensystemforschung, Max-Planck-Stra?e 2, 37191, Katlenburg-Lindau, Germany 6. Instituto Nacional de T??cnica Aeroespacial, 28850, Torrej??n de Ardoz, Madrid, Spain 4. High Altitude Observatory, P.O. Box 3000, Colorado, 80301, USA 3. Instituto de Astrof??sica de Canarias, C/Via L??ctea, s/n, 38205, La Laguna (Tenerife), Spain 5. Lockheed Martin Solar and Astrophysics Laboratory, Bldg. 252, 3251 Hanover Street, Palo Alto, CA, 94304, USA |
| Abstract: | This paper describes the wave-front correction system developed for the Sunrise balloon telescope, and it provides information about its in-flight performance. For the correction of low-order aberrations, a Correlating Wave-Front Sensor (CWS) was used. It consisted of a six-element Shack??C?Hartmann wave-front sensor (WFS), a fast tip-tilt mirror for the compensation of image motion, and an active telescope secondary mirror for focus correction. The CWS delivered a stabilized image with a precision of 0.04?arcsec (rms), whenever the coarse pointing was better than ???45?arcsec peak-to-peak. The automatic focus adjustment maintained a focus stability of 0.01?waves in the focal plane of the CWS. During the 5.5?day flight, good image quality and stability were achieved during 33?hours, containing 45?sequences, which lasted between 10 and 45?min. |
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