Incoherent scatter spectral measurements of the summertime high-latitude D-region with the EISCAT UHF radar |
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| Institution: | 1. Medical University of South Carolina, Department of Obstetrics and Gynecology, 331 Fort Johnson Road, Charleston, SC 29412, United States;2. Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, United States;3. National Institute of Standards and Technology, Chemical Sciences Division, Environmental Chemical Sciences Group, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, United States;4. Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC 29412, United States;1. Department of Physics and Astronomy, Clemson University, Clemson, SC, United States;2. SRI International, Menlo Park, CA, United States;3. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, United States;4. Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, United States;5. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States;1. Ann and H. J. Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, United States;2. Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada |
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| Abstract: | Measurements of incoherent scatter spectra from the auroral D-region were obtained during the summer of 1985 using a sophisticated pulse-to-pulse correlation technique with the EISCAT UHF radar. The spectral width variations with altitude are interpreted in terms of ion-neutral collision frequency, neutral temperature, mean positive ion mass and negative ion number density. Close agreement with predictions of currently available atmospheric models is obtained, except for a narrow layer around 86 km altitude. This layer showed evidence of increased positive ion mass for most of the experiment, and for short intervals indicated a mean ion mass close to 200 a.m.u. It is suggested that the layer is composed of proton hydrates in the vicinity of a structured noctilucent cloud, and that the index of hydration is occasionally large. |
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