Characterizing the Temporal and Spatial Stability of Atmospheric Transmission from 400 to 1050 nm.

Details Characterizing the Temporal and Spatial Stability of Atmospheric Transmission from 400 to 1050 nm. Characterizing the Temporal and Spatial Stability of Atmospheric Transmission from 400 to 1050 nm.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.a13b0892b&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #A13B-0892

Astronomy and Astrophysics

Astronomy

0300 Atmospheric Composition And Structure, 0360 Radiation: Transmission And Scattering

Scientific paper

The transmission function of the atmosphere is formally a function of wavelength, time, and line-of-sight. Making simplifying assumptions, such as linearity with airmass and temporal stability, enables the coarse removal of atmospheric extinction from ground-based observations of astronomical sources. However, these assumptions have not been rigorously justified to percent level precision, and small scale temporal or spatial variations could introduce non-negligible systematic errors. Systematic errors due to the atmosphere stand to inhibit the high precision measurements which are the focus of next-generation astronomical studies. We present a method of characterizing temporal and spatial variation in atmospheric transmission via spectrographic measurements of at least two standard stars simultaneously. These observations can be made on small-aperture telescopes with a simple spectrograph and can be coupled to large-aperture astronomical telescopes in order to provide real-time atmospheric diagnostics. We also present a spectrograph designed to yield efficient observations on the broad wavelength range of 400-1050 nm and our first results from this instrument.

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