Comparison between some methods for estimating thermospheric parameters using ionospheric incoherent scatter measurements |
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| Authors: | Shchepkin L A Kushnarenko G P Kuznetsova G M |
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| Institution: | 1.Institute of Solar-Terrestrial Physics, P.O. Box 291, Irkutsk, 664033, Russia
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| Abstract: | Three methods for estimating the atomic oxygen density and exospheric temperature using the ionospheric incoherent scatter
measurements have been compared. These methods are based on the usage of the relationship obtained from the energy conservation
equation. They are applicable under the conditions of the atmosphere composed of oxygen atoms and ions. The first method is
based on the regression analysis of finding minimal deviations of the calculated electron densities (N) from the values measured at altitudes of 300–450 km. The second method is based on solving the set of equations of the analytical
expression relating N to ionospheric characteristics. These equations are given for several altitudes. The third method is related to the selection
of such atomic oxygen densities at which the neutral gas temperature remains constant at an altitude above 350 km. All methods
give similar results. The calculations based on the measurements performed at the Irkutsk radar on September 23, 1998, showed
that the atomic oxygen densities at 400 km, estimated using the first and second methods, account for 0.48 of the value predicted
by the MSIS-86 model, and such densities estimated using the third method account for 0.59 of the model value. In this case
the estimated exospheric temperatures are larger than the values obtained using the thermospheric model by 11% for the first
and second methods and by 14% for the third method. |
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