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Bezymianny is one of the most active volcanoes in Kamchatka and the world. The intensification of its activity began in December 2016 after four years of silence during 2012–2016. There were three paroxysmal  explosive  volcanic  eruptions  in  2017;  the  paper  is  devoted  to  the  event  on  December  20  with  ash  removal  up  to  15  km  above  sea  level.  We  describe  the  course  of  the  eruption  and  the  results  of  its  analysis, including an animated image of the motion of the ash cloud from the volcano, performed on a  series  of  images  of  Himawari-8  (http://dvrcpod.planeta.smislab.ru/animation/1513757110.gif),  with overlaid on it results of modeling the distribution of this ash cloud (http://dvrcpod.planeta.smislab.ru/animation/1513777733.gif). The eruptive cloud moved northeast of the volcano at an average speed of 100  km/h,  the  main  area  covered  by  ash  clouds  was  about  78  000  km 2,  including  42 600 km2 on  land.  Ash  clouds  after  the  eruption  were  recorded  in  the  atmosphere  at  a  distance  of  1500–2000  km  to  the  northeast of the volcano until December 22, 2017. In addition to ash deposits, as a result of the eruption, deposits of pyroclastic flows (with run out to 5–6 km from the volcano) and mud streams (about 18  km)  were  formed  in  Vostochnaya  Valley  and  Sukhaya  Khapitsa  River.  Satellite  monitoring  of  the  volcano  and  analysis  of  the  eruption  data  was  carried  out  using  information  systems  VolSatView  and Signal.