| Issue |
A&A
Volume 542, June 2012
GREAT: early science results
|
|
|---|---|---|
| Article Number | L4 | |
| Number of page(s) | 13 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361/201218925 | |
| Published online | 10 May 2012 | |
GREAT/SOFIA atmospheric calibration⋆
1 I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
e-mail: guan@ph1.uni-koeln.de
2 Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Received: 31 January 2012
Accepted: 27 February 2012
The GREAT observations need frequency-selective calibration across the passband for the residual atmospheric opacity at flight altitude. At these altitudes the atmospheric opacity has both narrow and broad spectral features. To determine the atmospheric transmission at high spectral resolution, GREAT compares the observed atmospheric emission with atmospheric model predictions, and therefore depends on the validity of the atmospheric models. We discuss the problems identified in this comparison with respect to the observed data and the models, and describe the strategy used to calibrate the science data from GREAT/SOFIA during the first observing periods.
Key words: atmospheric effects / submillimeter: general
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2012
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