Neutral temperatures from Thomson scatter measurements: Comparisons with the CIRA(1972) |
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Authors: | JM Forbes ME Hagan KSW Champion |
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Institution: | 1. Department of Physics, Boston College, Chestnut Hill, MA 02167, U.S.A.;7. Aeronomy Division, Air Force Geophysics Laboratory, Hanscom AFB, Bedford, MA 01730, U.S.A. |
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Abstract: | Neutral exospheric and lower thermospheric (100–130 km) temperatures from Thomson scatter measurements at Millstone Hill (42°N) are compared with CIRA temperatures with a view towards identifying deficiencies in the CIRA and recommending revisions. CIRA models the observed diurnal mean temperatures (T0) to within 10% over a wide range of solar conditions (75? F10.7 ? 250), but consistently underestimates the diurnal temperatures with maximum deviations approaching 50% of observed amplitudes (180–240 K) at solar maximum (1200 K ? T0 ? 1400 K). The observed semidiurnal amplitudes, which lie in the range of 20K–80K, are always underestimated and frequently by more than 50%. In the lower thermosphere, tidal oscillations of temperature of order 20K–40K occur which are not modelled by CIRA. In addition, an analysis of exospheric temperatures at Millstone Hill during a magnetic disturbance indicates a response within 1–2 hours from storm onset, whereas CIRA assumes a 6.7 hour delay. Although some of these deficiences are addressed by the more recent MSIS model, there exists a sufficient data base to recommend several additional revisions to the CIRA temperatures at this time. |
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