Dear Renish,
do you use Planck or Rayleigh-Jeans brightness temperature? For Planck,
you should indeed approach the ambient temperature if you go low enough.
Cheers
Stefan
On 20 Apr 2021, at 12:46, Thomas,Renish wrote:
Hi Everyone,
I had some questions about the calculated brightness temperature in
ARTS.
When I calculate the brightness temperature for an atmospheric
scenario in "horizon looking mode" and in clearsky. I get a brightness
temperature at 183.31 GHz (Water vapor absorption line), which is
about 3 to 6 degrees lower than the ambient temperature.
I would assume that at the water vapor absorption line and at low
altitudes (~2 km above sea level), I should measure very close to the
ambient temperature (Due to high absorption).
So, my questions are:
1.) Is this brightness temperature bias expected?, or can something
else cause this?
Thanks,
Renish
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