National Space Weather Monitoring and Warning Center
A red alert for geomagnetic storms was issued at 9 o'clock on the 11th:
A geomagnetic storm will occur from 23:00 on May 10, 2024, Beijing time, with the maximum level reaching the level of ultra-geomagnetic storm (Kp=9), and it is expected that the magnetic storm process will continue in the next 24 hours, and geomagnetic storms may still occur in the future. Under the influence of geomagnetic storms, the ionosphere will be disturbed in most parts of the continent, and shortwave communication and navigation and positioning will be affected to varying degrees. A significant increase in the density of the upper atmosphere will lead to an increase in the orbital attenuation of low-orbit satellites. The National Space Weather Monitoring and Warning Center will closely track the development of the event and release forecast and early warning information in a timely manner.
According to @Xinjiang Daily,
Affected by the geomagnetic storm,
In the early morning of May 11,
Fuyun County, Altay Prefecture, Xinjiang
Urumqi Nanshan,
Rare auroras appear in many places such as Sailim Lake in Bozhou.
What is a geomagnetic storm?
As the most typical solar eruption activity, a coronal mass ejection process can throw hundreds of millions of tons of solar material off the surface of the sun at a high speed of hundreds of kilometers per second, not only the kinetic energy of the huge mass and velocity convergence, but also the powerful magnetic field energy of the sun, once it hits the earth, it will cause a change in the direction and magnitude of the geomagnetic field, that is, a geomagnetic storm.
With the gradual intensification of magnetic storm activity, the Earth's upper atmosphere is continuously heated, and then expands and spreads into higher space, which creates additional drag for the spacecraft to fly in orbit, produces a drag-like deceleration effect, and reduces the orbital altitude of the spacecraft, and the reduction of altitude corresponds to a denser atmospheric environment, which will further bring greater flight resistance, so as to form a vicious circle of flight speed slowing down - altitude reduction - greater drag - further deceleration - faster altitude reduction, It poses a great threat to the safety of spacecraft.
Geomagnetic storms can affect navigation
And ordinary people don't need special protection
When a geomagnetic storm occurs, spacecraft and astronauts will be bombarded by more high-energy particles in space, which will endanger their lives and health and the safety of spacecraft.
Ordinary people do not need special protection against geomagnetic storms, and the intense activity of the sun has nothing to do with the intensity of ultraviolet radiation. "Sunscreen is completely out of touch with solar storms and geomagnetic storms. It is only needed when the plateau, the atmosphere is thin, and the ultraviolet radiation is strong. "However, geomagnetic storms do have certain effects, such as navigation," he said. Ionospheric disturbances caused by geomagnetic storms can affect radio waves, causing disturbances and even disruptions. ”
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