Aviation and Jet Contrails: Impact on Astronomy

Impact of Aviation on Climate

range; see Lee et al. 2009). Aircraft emissions are expected to increase with projected growth in aviation and will likely result in enhanced environmental impacts unless scientif ically informed mitigation measures are implemented. Environmental protection is an important component of the U.S. Next Generation Air Transportation System (NextGen; information online at www.jpdo. gov/nextgen.asp)....

Impact of Non-CO2 Combustion Effects from Aviation on the Environmental Feasibility of Alternative Jet Fuels

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Impact of Aviation on Climate: FAA’s Aviation Climate

On the regional climatic impact of contrails: microphysical and radiative properties of contrails and natural cirrus clouds

The impact of contrail-induced cirrus clouds on regional climate is estimated for mean atmospheric conditions of southern Germany in the months of July and October. This is done by use of a regionalized onedimensional radiative convective model (RCM). The in ̄uence of an increased ice cloud cover is studied by comparing RCM results representing climatological values with a modi®ed case. In order...

Impact of Cognitive Radio on Radio Astronomy

The introduction of new communication techniques requires an increase in the efficiency of spectrum usage. Cognitive radio is one of the new techniques that fosters spectrum efficiency by using unoccupied frequency spectrum for communications. However, cognitive radio will increase the transmission power density and cause an increasing level of Radio Frequency Interference (RFI), which may impa...