Opened 18 years ago

Closed 18 years ago

#29 closed enhancement (fixed)

opacity?

Reported by: Tony.Wong@… Owned by: Malte Marquarding
Priority: low Milestone: ASAP2 release
Component: General Version: 2.0
Severity: normal Keywords:
Cc: Tony.Wong@…

Description

Just curious about how opacity is calculated in ASAP. We've been thinking of creating a variable for the zenith opacity in the syscal record of the RPFITS file, once Mopra's noise diode is well-calibrated. This would be calculated by TCS based on noise diode and paddle measurements. So obviously this should be coordinated with whatever is done in ASAP.

Tony

Change History (2)

comment:1 Changed 18 years ago by Malte Marquarding

Cc: Tony.Wong@… added
Priority: normal → low
Severity: normal → enhancement
Status: new → assigned

If you look at 

ASAP> help scantable.opacity

it is just 

Opacity from which the correction factor is exp(tau*ZD)
where ZD is the zenith-distance.

I can add a keyword in ASAP which holds the zenith opacity value and use this when it is defined. I will add this to the asap2.0 release, just in case it appears in rpfits at some stage.

comment:2 Changed 18 years ago by Malte Marquarding

Resolution: → fixed
Status: assigned → closed

A column holding this value was added to the Scantable.

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