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On 10 September 2007 between 10:00 and 14:00 UT, the OMTI all-sky imager atParatunka (Kamchatka, Russia, GLAT~52°) observed the onset andsouth-western progression of a localized depletion region in the airglowintensity. The perturbation, while being stretched in the NW-SE direction,crossed the entire field of view of the camera. During the event, theHokkaido SuperDARN HF radar was monitoring echoes in the Paratunkalongitudinal sector. It was detecting a localized band of ground scatterechoes progressing equatorward synchronously with the motion of the opticalperturbation. It is suggested that both features resulted from the onset andsouth-western progression of a localized region with enhanced electric fieldthat influenced the distribution of the plasma density in the ionosphere.Modeling of the HF ground scatter dynamics based on numerical ray tracingdemonstrated qualitative consistency with the observations

Joint observations of a traveling ionospheric disturbance with the Paratunka OMTI camera and the Hokkaido HF radar