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SET ATMOSPHERE

        CLIC\SET ATMOSPHERE Argument Value /ANTENNA a1 [a2 ...]

    Selects  the  way atmospheric calibration is done by command ATMOSPHERE,
    Argument may be FILE, AUTO, TREC, or MANUAL. This will affect the anten-
    nas  given  in argument to the option /ANTENNA (/ANTENNA ALL selects all
    antennas). Argument may also be NEW, 2003, OLD, 1985, to switch  between
    atmospheric  model  versions;  option  /ANTENNA  is not required in that
    case.

      - In FILE mode the actual mode is taken from the data header,  as giv-
        en in the OBS program.

      -  In  TREC mode the receiver temperature is assumed known, to set the
        scale of measured sky temperature and optical depth,  and  determine
        the  system  noise  temperature.   The receiver temperature is taken
        from the data header, as given in OBS.  It may be forced to  a  dif-
        ferent  value by giving it as second argument 'value', or by the SET
        TREC command.

      - In AUTO mode the water wapor content is assumed  known;  it  is  de-
        termined   from   the  antennas  in TREC mode, if any, or taken from
        the data header, or forced  to  the  value  given   in   the  second
        argument 'value', or by the SET WATER command.

    These parameters, together with the wheather station data, are  used  to
    compute  the system noise temperature for each antenna.  In MANUAL mode,
    no model atmosphere is used,  but  the  values  of  optical  depths  and
    atmospheric temperatures stored in the data.

      - OLD or 1985 (the default) select the old ATM model, in use  at  IRAM
        since circa 1985.

      - NEW or 2003 select the new ATM model,developed by Juan Pardo isf ISM
        in Madrid.  For this the new ATM library must be available.  If  not
        the old ATM  will be used.


Gildas manager 2011-04-01