Modelling of the electron density profile in the lowest part of ionosphere D-region on the basis of radiowave absorption data: 1. Theoretical model |
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| Affiliation: | 1. Johns Hopkins University Applied Physics Laboratory, MS 200-E254, 11100 Johns Hopkins Rd, Laurel, MD 20723, USA;2. National Oceanic and Atmospheric Organization, Space Weather Prediction Center, 325 Broadway, Boulder, CO 80305, USA;3. Massachusetts Institute of Technology, Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA;4. NextGen Federal Systems, 33 Hofer Lane, Bozeman, MT 59718, USA;5. Space Sciences Laboratory, University of California, 7 Gauss Way, Berkeley, CA 94720, USA;6. Maxar Technologies Inc, 3875 Fabian Way, Palo Alto, CA 94303, USA;7. New Jersey Institute of Technology, Tiernan 101, 161 Warren St, Newark, NJ 07103, USA;8. University Corporation for Atmospheric Research, 3090 Center Green Drive, Boulder, CO 80301, USA;9. University of New Hampshire, 8 College Rd, Durham, NH 03824, USA;10. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA;11. The Aerospace Corporation, 2310 El Segundo Blvd., El Segundo, CA 90245, USA;12. NASA Johnson Space Center, 2101 E NASA Pkwy, Houston, TX 77058, USA;13. Southwest Research Institute, 1050 Walnut, St Suite 300, Boulder, CO 80302, USA;14. AFRL Space Vehicles Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 8711, USA;15. Mary W. Jackson NASA HQ Building, 300 E St, Washington, DC 20546, USA;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 |
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| Abstract: | A simplified full-wave method adapted to the propagation of very obliquely incident LF radio waves is developed. For a selected ionosphere model the wave-field structure is calculated inside a horizontally stratified ionosphere and the peculiarities of the reflected field are clearly described. The penetration of the investigated radio waves in the lower ionosphere at noon-time is found to be restricted to a layer several wavelengths thick. The reflected wave is created entirely by the mechanism of partial reflections and the region responsible for its formation is usually below 70 km. The influence of some typical parameters of the electron density profile, as well as the atmospheric pressure and temperature, on the attenuation of the investigated radio waves is demonstrated. It is also found that the reflection at very oblique incidence depends mainly on the height of the bottom of the ionosphere. |
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