The ionospheric behavior over Podkamennaya, Russia, during the geomagnetic storm of October 14, 1981, is modeled subject to the constraints provided by f0F2 measurements and by the thermospheric O/N2 ratio deduced from a DE 1 FUV image taken at 0540 UT. The (nonunique) diurnal variation of O/N2 deduced from the model is consistent with the thermospheric composition disturbance zone observed in the DE 1 image having moved over Podkamennaya during the early morning hours, producing a reduction of O/N2 (referred to a column density of N2 of 1017 cm-2) to a value of less than 0.2 before recovering to a value of 0.6 during the afternoon hours. Although the data are insufficient to provide a unique solution, the results demonstrate the utility of satellite-based FUV images in the study of thermospheric and ionospheric disturbances produced by geomagnetic storms. ¿ 2001 American Geophysical Union