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Ground based astronomical observations at mm and sub-mm wavelengths place extreme requirements on the transmission and stability of the atmosphere. Steady atmospheric emission loads the bolometric detectors and adds photon noise, reducing overall sensitivity. Fluctuations in atmospheric brightness add noise to the detector timestream data as well.
For these reasons high altitude sites, preferably with stable atmospheric conditions, are needed for ground based observations such as those targeted by the SPT.
Emission from the atmosphere consists of two components, one due to “dry air” which results from the wings of oxygen lines and a second component due to water vapor. The “dry air” component is well-mixed in the atmosphere and produces a signal that is only a function of elevation, commonly removed by beam switching. Water vapor, on the other hand, exhibits considerable variations in its density. These fluctuations in water vapor density result in spatial variations in the brightness of the sky.
Originally posted by Kinesis
reply to post by neformore
. . . Scapegoating the growing problem we face on earth, by asserting that every other planet in our solar system is suffering the same ill effects because of the sun is entirely baseless.
Originally posted by chromatico
reply to post by OptionToChoose
There is zero evidence for said dark star or rogue planet. Please go throw away your Sitchin books now!
Originally posted by chromatico
reply to post by OptionToChoose
That's just a despicable stock hardcore believer trick. Asking me to DISPROVE something. Well, you wanna know something? It's impossible to disprove most things, including what you just asked me to. You, however, are the one making the claim, so you have the burden of proof. We should not believe something exists until we have proof positive of it, something you cannot provide.
[edit on 23-3-2008 by chromatico]
if warming/climate change is really taking place throughout the Solar System,
www.virtuallystrange.net...
Sat, 29 Mar 2003 05:56:51 -0800
"Ex-DIA analyst and UFO-reality proponent John Maynard has been arrested and charged for violating his National Security oath as regards statements made in conjunction with his activity as a UFO-reality witness with the Disclosure Project. He currently is incarcerated in a federal facility, location uncertain."
Originally posted by chromatico
reply to post by OptionToChoose
There is zero evidence for said dark star or rogue planet. Please go throw away your Sitchin books now!
Originally posted by chromatico
reply to post by OptionToChoose
That's just a despicable stock hardcore believer trick. Asking me to DISPROVE something. Well, you wanna know something? It's impossible to disprove most things, including what you just asked me to. You, however, are the one making the claim, so you have the burden of proof. We should not believe something exists until we have proof positive of it, something you cannot provide.
[edit on 23-3-2008 by chromatico]