Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21a0424t&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21A-0424
Physics
2419 Ion Chemistry And Composition (0335), 2467 Plasma Temperature And Density, 2481 Topside Ionosphere
Scientific paper
A new global empirical model of ion composition in the region of the outer ionosphere (altitude range of 500 to 2500 km) has been developed for the most important ions (O+, H+, He+, and N+). It is based on the model proposed by Triskova et al., 2002 and includes several improvements. The model relies on data sets from solar maxima and solar minima. To get model values for an arbitrary solar activity level, different interpolation/extrapolation techniques taking these two levels as anchor points are used. Relative/absolute ion density obeying first order influences has been approximated by a system of orthonormal functions at several fixed altitude ranges. Various functions including physical processes are tested for expression of the altitude dependence to obtain smooth profiles of the upper transition height. This model is compared with newly available data from the RPA instrument onboard the Intercosmos 24 satellite, and from the ion mass spectrometer onboard OGO 6.
Smilauer Ja.
Triskova Ludmila
Truhlik Vladimir
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