Seasonal and tidal variations of neutral temperatures and densities in the high latitude lower thermosphere measured by EISCAT |
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| Institution: | 1. Foundation Medicine, Inc., Cambridge;2. Center for Informatics, City of Hope National Medical Center, Duarte;3. Department of Computational and Quantitative Medicine, Beckman Research Institute of the City of Hope, Duarte;4. Department of Medical Oncology and Therapeutics Research, City of Hope Comprehensive Cancer Center, Duarte;5. Department of Pathology, SUNY Upstate Medical University, Syracuse;6. Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago;7. Division of Hematology and Oncology, Department of Internal Medicine, UC Davis Comprehensive Cancer Center, Sacramento;8. Department of Hematology/Oncology, Comprehensive Cancer Centers of Nevada, Las Vegas;9. The Angeles Clinic and Research Institute, Los Angeles, USA |
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| Abstract: | Measurements of ion temperature, ion-neutral collision frequency and ion drift in the E-region from the period December 1984 to November 1985 are used to derive neutral temperatures, densities and meridional winds in the altitude intervals 92–120 km, 92–105 km and 92–120 km, respectively. Altitude profiles of temperature and density and their seasonal variations are compared with the CIRA 1972 and MSIS 1983 models and the effects of geomagnetic activity are demonstrated. Semi-diurnal tidal variations in all three parameters are derived and the comparison with lower latitude measurements is discussed. |
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