On the diurnal variation of the E-region coherent HF echo occurrence |
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| Authors: | BA Carter RA Makarevich |
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| Institution: | 1. Earth and Atmospheric Sciences, Cornell University, Ithaca, New York, United States;2. Physics and Astronomy, Clemson University, Clemson, South Carolina, United States;3. University of the Virgin Islands, St. Croix, USVI, United States;4. Arecibo Observatory, Arecibo, Puerto Rico, United States;1. Australian Maritime College, University of Tasmania, Maritime Way, Launceston, TAS 7248, Australia;2. Intelligent Sensing and Systems Laboratory, CSIRO Computational Informatics, Hobart, TAS 7000, Australia;3. CMST Curtin University, Kent Street, Bentley, Perth, WA 6102, Australia;4. Faculty of Engineering, Memorial University of Newfoundland, Box 43, St. Johns, NL, Canada;1. South Regional Center for Space Research, National Institute for Space Research (CRS-INPE) and Space Science Laboratory of the Federal University of Santa Maria (LACESM/CT-UFSM), Santa Maria, RS, Brazil;2. Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil;3. Instituto de Pesquisa e Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), Sao Jose dos Campos, Brazil;4. Aeronomy Division, National Institute for Space Research (DAE-INPE), Sao Jose dos Campos, Brazil;5. Center for Space Physics, Boston University, Boston, MA, USA;1. Laboratoire de Géophysique, FSTGAT, B.P.32 USTHB, 16123 Bab-Ezzouar, Alger, Algeria;2. LPP/Polytechnique/UPMC/CNRS, 4 place Jussieu 75005, France;3. ICTP, Trieste, Italy;4. Lab-STICC, UMR CNRS 6285, Mines-Télécom Bretagne CS, 83818 Brest cedex 3, France |
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| Abstract: | We present a statistical study of the diurnal variations of the E-region backscatter occurrence observed by 15 SuperDARN radars over 3 years. The diurnal variation of echo occurrence observed by each radar is examined for three levels of geomagnetic activity. It is found that the E-region echo occurrence for individual radars exhibits very similar diurnal variations for low geomagnetic activity, with the differences between radars increasing with activity. This indicates that local processes become more important in the generation of the E-region echoes during disturbed periods. It is also shown that the majority of E-region backscatter structures take the form of diffuse echo bands rather than discrete echo patches, with the dominance of diffuse echoes increasing with activity. Finally, a hypothesis that the echo occurrence is controlled by the radar's coverage of the auroral oval is tested using the electron and ion oval models derived from the DMSP satellite observations. |
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