The magnetic storm began on Earth on Wednesday evening - the geomagnetic disturbance index Kp reached 6, one more than the minimum value that is considered a storm, according to the US National Oceanic and Atmospheric Administration (NOAA) Space Weather Forecast Center.
The level of magnetic disturbances began to grow at about 15.00 Moscow time and by 18.00 reached the "red zone". Currently, the Kp index characterizing geomagnetic activity has already reached a value of 6. There are 10 levels on this scale, values from 0 to 3 correspond to a quiet magnetosphere, level 4 - to a disturbed one, and levels from 5 to 9 - to magnetic storms of five classes.
A magnetic storm can "hold out" for a whole day, since it is caused by an exceptionally powerful ejection of plasma into the Sun, Sergei Bogachev, an employee of the Laboratory of X-ray Astronomy of the Lebedev Physical Institute (FIAN), told RIA Novosti.
"It was a long coronal ejection, which began on the night of April 2. It came from the southern hemisphere of the Sun, and although it flew in the plane of the Earth's orbit, it did not go directly to the Earth," Bogachev said.
Disturbances in the Earth's magnetosphere - magnetic storms - arise under the influence of solar plasma streams, charged particles ejected by the Sun. Particles "hitting" the magnetosphere cause it to vibrate, which can cause interruptions in radio communications.
More about the nature of magnetic storms and their effect on the human body >>
“We argued, it was not clear whether this emission would reach the Earth or not. But still, it did,” Bogachev said.
"The blowout was unusually strong. The storm will last at least a day," he added.