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Proceedings Paper

Large-field high-resolution mosaic movies
Author(s): Robert H. Hammerschlag; Guus Sliepen; Felix C. M. Bettonvil; Aswin P. L. Jägers; Peter Sütterlin; Sara F. Martin
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Paper Abstract

Movies with fields-of-view larger than normal for high-resolution telescopes will give a better understanding of processes on the Sun, such as filament and active region developments and their possible interactions. New active regions can influence, by their emergence, their environment to the extent of possibly serving as an igniter of the eruption of a nearby filament. A method to create a large field-of-view is to join several fields-of-view into a mosaic. Fields are imaged quickly one after another using fast telescope-pointing. Such a pointing cycle has been automated at the Dutch Open Telescope (DOT), a high-resolution solar telescope located on the Canary Island La Palma. The observer can draw with the computer mouse the desired total field in the guider-telescope image of the whole Sun. The guider telescope is equipped with an H-alpha filter and electronic enhancement of contrast in the image for good visibility of filaments and prominences. The number and positions of the subfields are calculated automatically and represented by an array of bright points indicating the subfield centers inside the drawn rectangle of the total field on the computer screen with the whole-sun image. When the exposures start the telescope repeats automatically the sequence of subfields. Automatic production of flats is also programmed including defocusing and fast motion over the solar disk of the image field. For the first time mosaic movies were programmed from stored information on automated telescope motions from one field to the next. The mosaic movies fill the gap between whole-sun images with limited resolution of synoptic telescopes including space instruments and small-field high-cadence movies of high-resolution solar telescopes.

Paper Details

Date Published: 17 September 2012
PDF: 18 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 844406 (17 September 2012); doi: 10.1117/12.924244
Show Author Affiliations
Robert H. Hammerschlag, Utrecht Univ. (Netherlands)
Guus Sliepen, Institute for Solar Physics, Royal Swedish Academy of Sciences (Sweden)
Felix C. M. Bettonvil, ASTRON (Netherlands)
Leiden Observatory (Netherlands)
Aswin P. L. Jägers, Utrecht Univ. (Netherlands)
Peter Sütterlin, Institute for Solar Physics, Royal Swedish Academy of Sciences (Sweden)
Sara F. Martin, Helio Research (United States)

Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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