What is geomagnetic activity?

Magnetic storm (geomagnetic activity) is the most typical solar burst activity.

A coronal mass ejection process can throw hundreds of millions of solar materials off the surface of the sun at a high speed of hundreds of kilometers per second. Not only is the kinetic energy gathered by huge mass and speed, but also the powerful magnetic field energy of the sun. Once it hits the earth, it will cause changes in the direction and size of the geomagnetic field, that is, geomagnetic storms.

With the gradual strengthening of magnetic storm activity, the upper atmosphere of the earth is constantly heated, and then spreads to higher space, which produces additional resistance to the spacecraft's in-orbit flight, produces drag-like deceleration effect and reduces the orbital height of the spacecraft.

The decrease of altitude corresponds to a denser atmospheric environment, which will further bring greater flight resistance, thus forming a vicious circle of slow flight speed-altitude decrease-greater resistance-further deceleration-altitude decrease faster, which poses a great threat to spacecraft safety.

Activity early warning

165438+20231On October 30th, the National Space Weather Monitoring and Early Warning Center of China Meteorological Bureau issued a magnetic storm warning. It is predicted that geomagnetic storms may occur in three days:165438+1October 30th, 65438+February 60th and 2nd, of which 65438+February 60th.

The forecast suggests that this solar eruption is likely to produce high-intensity and gorgeous aurora in 65438+February 1 day, and northern China, such as Heilongjiang and Xinjiang, will have the opportunity to see red or even green aurora.

On June 5438+February 1 day, 2023, according to the detection of the Space Weather Center of China Meteorological Bureau, geomagnetic storms may occur in China on June 5438+February 1 day and February 2, among which moderate or even geomagnetic storms may occur on June 5438+February 1 day. On February 2, 65438, according to the monitoring and forecast of the National Space Weather Monitoring and Early Warning Center, a small to moderate geomagnetic storm may occur on February 4, 65438 due to the combined influence of the solar wind and CME of Sun East Expressway on February 4, 2008.

The above content refers to Baidu Encyclopedia-Violence in Di Zi.