Observational technique and parameter estimation in plasma line spectrum observations of the ionosphere by chirped incoherent scatter radar |
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| Institution: | 1. National Observatory of Athens, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, 15236 Penteli, Greece;2. Space Environment and Radio Engineering Group (SERENE), University of Birmingham, B15 2TT Birmingham, UK;3. Department of Physics, University of New Brunswick, PO Box 4440, Fredericton NB E3B 5A3, Canada;4. German Aerospace Center, 17235 Neustrelitz, Germany;5. University of Colorado, Boulder, CO 80302, USA;6. Institute of Meteorology and Water Management - National Research Institute, 01-673 Warsaw, Poland;7. Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland;8. Department of Physics, University of Oslo, PO Box 1048 Blindern, 0316 Oslo, Norway;9. Instituto de Astrofísica e Ciências do Espaço, Physics Department, University of Coimbra, 3040-004 Coimbra, Portugal;10. Instituto de Astrofísica e Ciências do Espaço, Department of Earth Sciences, University of Coimbra, 3040-004 Coimbra, Portugal;11. Center for Advanced Public Safety, University of Alabama, Tuscaloosa, AL 35487, USA;12. Yonsei University, Department of Atmospheric Sciences, Seoul 03722, South Korea;1. National Space Science Center, Chinese Academy of Sciences, Beijing, China;2. Beijing Key Laboratory of Space Environment Exploration, Beijing, China;3. Key Laboratory of Environmental Space Situation Awareness Technology, Beijing, China;4. National Satellite Meteorological Center, China Meteorological Administration, Beijing, China;1. Department of Physics and Technology, UiT The Arctic University of Norway, Tromsø, Norway;2. EISCAT Scientific Association, Kiruna, Sweden;1. Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK;2. AWE PLC, Reading RG7 4PR, UK;1. Space Research Institute, Moscow, Russia;2. Centre of Institute for Space Research, Lviv, Ukraine;3. Institute of Physics of the Earth, Moscow, Russia |
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| Abstract: | With the 430 MHz incoherent scatter radar facility at the Arecibo Observatory, the plasma line spectrum has been measured with a linearly frequency modulated or ‘chirped’ pulse. On reception the signal is demodulated (‘dechirped’). The paper describes the experimental set-up and the parameter estimation for day-time ionosphere observations. Using a non-linear least squares fit it is possible to determine the linear and quadratic coefficients of a locally parabolic plasma line frequency versus height profile. The strength of the plasma line and the point of tangency of the locally parabolic plasma line frequency profile can be determined very accurately. In measurements of the day-time ionosphere the plasma line was found to be enhanced by about 70 times over the thermal equilibrium level. |
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