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

On 10 September 2007 between 10:00 and 14:00 UT, the OMTI all-sky imager at Paratunka (Kam- chatka, Russia, GLAT 52 ) observed the onset and south- western progression of a localized depletion region in the air- glow intensity. The perturbation, while being stretched in the NW-SE direction, crossed the entire field of view of the cam- era. During the event, the Hokkaido SuperDARN HF radar was monitoring echoes in the Paratunka longitudinal sector. It was detecting a localized band of ground scatter echoes progressing equatorward synchronously with the motion of the optical perturbation. It is suggested that both features re- sulted from the onset and south-western progression of a lo- calized region with enhanced electric field that influenced the distribution of the plasma density in the ionosphere. Model- ing of the HF ground scatter dynamics based on numerical ray tracing demonstrated qualitative consistency with the ob- servations.

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