Volume 546, October 2012
|Number of page(s)||13|
|Published online||02 October 2012|
Comparison of the scintillation noise above different observatories measured with MASS instruments
1 Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetsky pr-t 13, Moscow, Russia
2 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
3 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
4 Thirty Meter Telescope Observatory Corporation, 1111 South Arroyo Parkway, Suite 200, Pasadena, CA 91105, USA
Received: 5 July 2012
Accepted: 13 August 2012
Aims. Scintillation noise is a major limitation of ground-based photometric precision.
Methods. An extensive dataset of stellar scintillation collected at 11 astronomical sites world-wide with MASS instruments was used to estimate the scintillation noise of large telescopes in the fast photometry and traditional long-exposure regime.
Results. Statistical distributions of the corresponding parameters are given. The scintillation noise is mostly determined by turbulence and wind in the upper atmosphere and is comparable at all sites, with slightly lower values at Mauna Kea and the highest noise at Tolonchar in Chile. We show that the classical Young’s formula underestimates the scintillation noise. The temporal variations of the scintillation noise are also similar at all sites, showing short-term variability at time scales of 1 − 2 h and slower variations, including marked seasonal trends (stronger scintillation and less clear sky during local winter). Some correlation was found between nearby observatories.
Key words: techniques: photometric / atmospheric effects / site testing
© ESO, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.