%0 Journal Article
%4 sid.inpe.br/mtc-m17@80/2007/11.23.16.45
%2 sid.inpe.br/mtc-m17@80/2007/11.23.16.45.48
%@doi 10.1016/j.asr.2007.09.032
%@issn 0273-1177
%T Nighttime thermospheric meridional neutral winds inferred from ionospheric hŒF and hpF2 data
%D 2008
%A Muella, Má,
%A Honorato, rcio Tadeu de Assis,
%A Fagundes, P. R.,
%A Bittencourt, José,
%A Augusto,
%A Sahai, Y.,
%A Lima, W. L. C.,
%A Becker-Guedes, F.,
%A Pillat, V. G.,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraí
%@affiliation ba (UNIVAP)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Universidade do Vale do Paraí
%@affiliation ba (UNIVAP)
%@affiliation Centro Universitá
%@affiliation rio Luterano de Palmas (CEULP)
%@affiliation Universidade do Vale do Paraí
%B Advances in Space Research
%V 41
%N 4
%P 599-610
%K Thermospheric neutral winds, F region, Atmospheric models, Digital ionosonde.
%X Nighttime thermospheric meridional winds aligned to the magnetic meridian have been inferred using hF and hpF2 ionosonde data taken from two equatorial stations, Manaus (2.9S, 60.0W, dip latitude 6.0N) and Palmas (10.17S, 48.2W, dip latitude 6.2S), and one low-latitude station, Sao Jose dos Campos (23.21S, 45.86W, dip latitude 17.26S), during geomagnetic quiet days of August and September, 2002. Using an extension of the ionospheric servo model and a simple formulation of the diffusive vertical drift velocity, the magnetic meridional component of the thermospheric neutral winds is inferred, respectively, at the peak (hpF2) and at the base (hF) heights of the F region over Sao Jose dos Campos. An approach has been included in the models to derive the effects of the electrodynamic drift over Sao Jose dos Campos from the time derivative of hpF2 and hF observed at the equatorial stations. The magnetic meridional winds inferred from the two methods, for the months of August and September, are compared with winds calculated using the HWM-90 model and with measurements from FabryPerot technique. The results show varying agreements and disagreements. Meridional winds calculated from hpF2 ionospheric data (servo model) may produce errors of about 59 m/s, whereas the method calculated from the F-region base height (hF) ionospheric data gives errors of about 69 m/s during the occurrence of equatorial spread-F.
%@language en
%3 nighttime.pdf