The electromagnetic spectrum is a vital part of our environment. Measures of radio frequency emissions from natural phenomena enable both practical applications, such as weather predictions and studies of the changing of Earth's climate here at home, and reveal the physical properties of cosmic sources. The spectrum is therefore a resource to be used wisely now and to be protected for future generations. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses: Second Edition sets forth the principles for the allocation and protection of spectral bands for services using the radio spectrum for scientific research. This report describes the radio frequency bands used by scientific services and includes relevant regulatory information and discussion of scientific use of frequency bands. This reference will guide spectrum managers and spectrum regulatory bodies on science issues and serve as a resource to scientists and other spectrum users. Table of ContentsFront MatterSummary1 Radio Frequency Regulation for the Scientific Services2 Scientific Background: Radio Astronomy Service3 Scientific Background: Earth Exploration Satellite Service4 Technical Aspects of Protection for the Scientific Use of the Radio Spectrum5 Science Service AllocationsAppendixesAppendix A: Definitions of TermsAppendix B: IEEE Standard Letter Designations for Radar BandsAppendix C: International Astronomical Union Spectral Lines of Most Importance Below 300 GHzAppendix D: International Astronomical Union Spectral Lines of Most Importance Between 300 and 1000 GHzAppendix E: International Astronomical Union Spectral Lines of Most Importance Above 1 THzAppendix F: Use of 0 dBi for Sidelobe Gain in Calculations of Interference in Radio Astronomy BandsAppendix G: Selected Rules and Regulations of the Federal Communications CommissionAppendix H: Selected Acronyms and Abbreviations
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