Two powerful plasma ejection that occurred on the Sun on Wednesday and Thursday, called a magnetic storm on Earth on Sunday night, according to the space weather forecast center of the National Oceanic and Atmospheric Administration of the USA (NOAA).
According to the center, about 01.00 MSK index of geomagnetic disturbances Kp, measured by a network of ground magnetic stations, reached a value of 6, despite the fact that the minimum level for a magnetic storm is 5. By 07.00 MSK index fell to "yellow" value of 4 and remains at that level.
In addition, the GOES satellites have recorded increase in the flux of protons near the planet, but it has not increased to a dangerous level for spacecraft.
Magnetic storms on Earth begin when the magnetosphere of the planet "hit" the Sun ejected plasmoids. Charged particles cause geomagnetic disturbances. If they reach a great power, it can lead to failures in electronic equipment, disruption to radio and electrical networks.
The current storm is the result of two coronal mass ejections that occurred in the active region 1504, which appeared on the visible side of the sun on June 9. This area of 13 and 14 June issued two powerful flash, which is accompanied by emission of the solar plasma. Speed of the first release was relatively low (604 kilometers per second), but the second release differed significantly speed — 1360 km / s.
As expected, both the plasma cloud should reach Earth around the same time — 17 June. The current geomagnetic disturbances are likely to have been caused by "joint impact" of these emissions.