Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa22a..02z&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA22A-02
Mathematics
Logic
2467 Plasma Temperature And Density, 0355 Thermosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting
Scientific paper
26 years of incoherent scatter observations over Millstone Hill since 1976 have been analyzed and modeled in order to study the climatological behavior in the local ionosphere-thermosphere system. A bin-fit technique is applied to process and represent the huge volume of data: measurements are binned according to local time, season, and altitude; sorted data in each bin are fitted into an empirical model where solar activity index F107 and geomagnetical activity index Ap are included as keyed inputs [Holt et al., 2002]. This paper focuses on seasonal, semiannual and annual variations and the long-term trend in electron density, electron temperature and ion temperature measurements over a 200-500 km height range of the F2 layer. A clear semiannual variation of the electron density is seen above the F2 peak during the day, as well as at the F2 peak and below during the later afternoon to evening period (16-20LT) . The semiannual variation of the electron temperature persists with minimum at equinox during the night, while the annual variation prevails by day with maximum in summer.
Holt John M.
Zhang Sheng
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