Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997angeo..15..314m&link_type=abstract
Annales Geophysicae, vol. 15, Issue 3, pp.314-326
Other
20
Scientific paper
A theoretical self-consistent method for the description of daytime <>N_e(h)<> profiles in the ionospheric F region measured by EISCAT is proposed. It is based on the use of a theoretical F-region model and measured electron density, <>N_e(h)<>, electron, <>T_e(h)<>, and ion temperature, <>T_i(h)<>, and field-aligned plasma drift <>V_l(h)<> profiles. The method describes the observed <>N_e(h)<> profile with high accuracy for quiet and disturbed conditions. Two versions of the method are considered: in the first the exospheric temperature <>T_{ex}<> is derived from a procedure minimizing <>[log (N_e(h)_{{obs}}/N_e(h)_{{cal}})](2<) >, in the second <>T_{ex}<> is deduced from the ion energy conservation in the F region. The method allows us to infer from the incoherent-scatter observations: concentrations of atomic oxygen, [O], molecular oxygen, <>[{O}_2]<>, molecular nitrogen, <>[{N}_2]<>, the vertical plasma drift, W, the exospheric temperature. <>T_{ex}<>, and the shape parameter <>S<> in the neutral temperature profile. The ratio <>([{O}(+]/N_e)<) > calculated by the theoretical model is used to correct <>T_e(h), T_i(h)<> and <>N_e(h)<> profiles routinely measured with EISCAT which are known to depend strongly on the actual applied ion-composition model. Such a correction is especially important for geomagnetically disturbed periods when the F region is strongly enriched with molecular ions. We conclude that four of the six thermospheric parameters, namely <>[{hbox {O}}],[{hbox {N}}_2]<>, <>W<> and <>T_{ex}<> can be confidently inferred from the EISCAT observations, while the other two derived parameters, <>[{hbox {O}}_2]<> and S are less reliable. The method can be used for the analysis of long-term (seasonal, solar cycle) as well as for day-to-day variations of the thermospheric parameters and the F-region ion composition using daytime incoherent-scatter observatio
Mikhailov Andrei
Schlegel Kristian
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