Unlike its active neighbors on the Kamchatka Peninsula, Raikoke Volcano on the Kuril Islands seldom erupts. The little, oval-shaped island most recently erupted in 1924 and in 1778.
The asleep period ended around 4:00 a.m. local time on June 22, 2019, when a large plume of ash and volcanic gases released from its 700-meter-wide crater. The event was recorded from space by astronauts aboard the International Space Station.
In the picture above you will see the volcanic plume rising in a thin column and then growing out in a part of the crest known as the ‘umbrella region’. That is the area where the body of the plume and the encircling air balance and the plume stops getting up. [source]