Views of the U.S. National Academy of Sciences and National Academy of Engineering on Agenda Items at Issue at the World Radiocommunication Conference 2012 (2013) / Chapter Skim
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Overarching Issues
Pages 40-42
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From page 40... ...
Our knowledge of the chemical makeup of the universe comes though measurements of narrow spectral lines arising from quantum mechanical transitions. Radio spectroscopic observations require measurements at frequencies determined by the physical and chemical properties of individual atoms and molecules, so it is important to protect the frequencies characteristic of most important atomic and molecular cosmic constituents.
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From page 41... ...
The ultimate impact of such emissions on a specific EESS geophysical measurement depends on the sensitivity of the geophysical parameter to changes in brightness temperature, as discussed in §2.2 of Spectrum Management for Science in the 21st Century. The maximum signal-power contamination that can exist without impacting the information contained in the EESS measurement has been derived by EESS scientists for each of the EESS allocated bands and is documented in Recommendation RS.1029.
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