[asac][almanews] ALMA Memos 415 and 418 Released

[Stacy Oliver]

ALMA MEMO #415

Phase Correction using Submillimeter Atmospheric Continuum Emission

S.Matsushita (CfA/SMA), H.Matsuo (NAOJ), M.C.Wiedner (CfA/SMA), J.R.Pardo
(Consejo Superior de Investigaciones Cientificas/CalTech)

2002/04

Keywords: Atmospheric Effects, Calibration, Phase Correction

We discuss a phase correction method using total power from
submillimeter/millimeter SIS receivers. The discussion is based on FTS
measurements and model calculations of submillimeter/millimeter atmospheric
emission under various weather conditions. Liquid water in the atmosphere
(cloud or fog) limits the phase correction accuracy using the total power
measurements. Comparison between millimeter and submillimeter total power
phase correctionshows that the sensitivity requirement is more easily met at
submillimeterwavelengths under good atmospheric conditions (precipitable
water vapor[pwv] < 1 mm), and the phase correction error due to liquid water
is muchless at these wavelengths. Simultaneous operation of millimeter and
submillimeter receivers will further reduce the phase correction error
appreciably.

View a pdf version of ALMA Memo #415.
http://www.alma.nrao.edu/memos/html-memos/alma415/memo415.pdf

Download a postscript version of ALMA Memo #415.
http://www.alma.nrao.edu/memos/html-memos/alma415/memo415.ps

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ALMA MEMO #418

GEOTECHNICAL STUDY, CHAJNANTOR SITE, 2002 CAMPAIGN, II REGION, CHILE

Geo Ambiental Consultores Ltda.

2002/03

The present report is written by Geo Ambiental Consultores Ltda. for the
European Southern Observatory and summarizes the findings at the Chajnantor
Site of the so called Cerro Chascón Science Preserve. At this site, a total
of 22 borings were drilled between January 6 and January 24 of year 2002 to
help in the geotechnical characterization for the development of the Atacama
Large Millimeter Array (ALMA) project.

** Please note: Figure 11 is currently not included. It will be added to the
document as soon as it becomes available.

View a pdf version of ALMA Memo #418.
http://www.alma.nrao.edu/memos/html-memos/alma418/memo418.pdf

Download a postscript version of ALMA Memo #418.
http://www.alma.nrao.edu/memos/html-memos/alma418/memo418.ps

Download a zipped postscript version of ALMA Memo #418.
http://www.alma.nrao.edu/memos/html-memos/alma418/memo418.zip


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