The Impact of the Altiplanic Winter on ALMA's Observing Conditions at Llano de Chajnantor

Details The Impact of the Altiplanic Winter on ALMA's Observing Conditions at Llano de Chajnantor The Impact of the Altiplanic Winter on ALMA's Observing Conditions at Llano de Chajnantor

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..41...63c&link_type=abstract

Astronomical Site Testing Data in Chile (Eds. M. Curé, A. Otárola, J. Marín, & M. Sarazin) Revista Mexicana de Astronomía y Astr

Astronomy and Astrophysics

Astronomy

Astmospheric Effects, Instrumentation: Interferometers, Methods: Data Analysis, Methods: Statistical, Site Testing

Scientific paper

Using the available NRAO's site characterization data, we study the observing conditions (PWV and Phase Stability) at Llano de Chajnantor during the ``Altiplanic Winter'' and their impact on ALMA scientific operations. The results suggest that during this period ALMA observations will be limited to lower frequency bands and compact array configurations. In terms of only the PWV, observations are possible until Band 6 (~230 GHz) the 70% of the time. Phase stability conditions suggest that atmospheric phase correction is strictly necessary during this period, allowing us to observe in the compact configurations at Band 3 (~100 GHz) about 55% of the time.

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