منابع مشابه
The science of space weather.
The basic physics underpinning space weather is reviewed, beginning with a brief overview of the main causes of variability in the near-Earth space environment. Although many plasma phenomena contribute to space weather, one of the most important is magnetic reconnection, and recent cutting edge research in this field is reviewed. We then place this research in context by discussing a number of...
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Forecasting space weather events presents the ultimate challenge to a space physics model. Not only should physical constraints be satisfied, but also practical issues such as timeliness, accuracy, and reliability must be adequately addressed. To address these needs, modern space weather forecasters and users rely on a great variety of space weather models, ranging from simple regressions and e...
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COGnitive radio systems for efficient sharing of TV white spaces in EUropean context (COGEU) is a threeyear Specific Target Research Project (STREP) supported by the EU 7th Framework Program which concluded in 2013. This paper presents the COGEU TV white space (TVWS) radio transceiver, a key demonstrator and deliverable of the project. The demonstrator consists of a Software Defined Radio (SDR)...
متن کاملSpace Weather Effects on Communications
An overview of historical and contemporary impacts of the solar and geospace environments on communications systems. Abstract In the last century and one-half, since the invention and deployment of the first electrical communication system – the electrical telegraph, the variety of communications technologies that can be affected by natural processes occurring on the Sun and in the space enviro...
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Ionospheric variability (space weather) significantly impacts ground and space-based communications. In essence, the electrically charged particles of the ionosphere (i.e., the partially ionized portion of the atmosphere starting at about 40 nautical miles (nm) above the Earth's surface) can attenuate, totally absorb, reflect, change direction of propagation, and change the phase and amplitude ...
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ژورنال
عنوان ژورنال: Journal of Space Weather and Space Climate
سال: 2013
ISSN: 2115-7251
DOI: 10.1051/swsc/2013054