Dynamics and structure of the vertical ionospheric disturbances caused by Tohoku earthquake according to Irkutsk bistatic CHIRP-sounding

In the work we present results of observation of the mid-scale vertical ionospheric irregularities caused by Tohoku earthquake (11/03/2011, 05:47UT) at distance 3400km from epicenter with 1 minute temporary resolution. Their spatial and temporary dynamics is also investigated. As showed the analysis of the experimental data, the main response of the ionosphere was observed at Irkutsk from 06:10UT to 07:00UT. Short-term variations of the electron density profile were also observed from 06:00UT. This corresponds to the main horizontal speed of disturbances about 4, 2-2.5 and 1.2-1.3 km/s. The vertical scale of the irregularities was 10-20 km. Irregularities practically weren't observed at heights above 180200km.