Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa11a..08h&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA11A-08
Physics
2411 Electric Fields (2712), 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting
Scientific paper
All Millstone Hill incoherent scatter radar data collected since 1978 are available through the Madrigal Database at MIT Haystack Observatory. A set of empirical models for basic and derived incoherent scatter parameters, including electron density Ne, electron and ion temperatures Te and Ti, electric field and parallel ion drift is being developed from this extensive dataset. Such models of the average behavior of key ionosphere-thermosphere (IT) parameters, based on long term accumulated data, are important for space weather studies not only in terms of quantitative descriptions of the IT system but also in terms of clarifying several outstanding scientific problems. This paper presents statistical models of the local electric field and geomagnetic-field-aligned ion drift in the ionospheric F-layer. All local (radar elevation > 45 degrees) ion line-of sight measurements are sorted into bins. The binning parameters are local time (0000-2400 LT), and day of year (season). Each data point has a corresponding solar flux index F10.7 and geomagnetic activity index Ap. A least-squares fit to all the data in each bin is computed to determine the electric field as a function of Ap and the field-aligned drift as a function of F107 and Ap. Unlike previous Millstone Hill local electric field models, the components of the drift are determined in a statistical sense rather than by first computing the parallel and perpendicular drift components from triplets of line-of-sight measurements. We will present the data distribution in each bin and discuss the main features of the results.
Holt John M.
Zhang Sheng
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