Last year, a powerful solar storm reached Earth, causing an aurora.

In May last year, the most powerful solar storm in about 21 years was confirmed to have caused colorful auroras around the world, including Germany, the UK, and China.

The Korea Astronomy and Space Science Institute said it observed the G5 class geomagnetic storm that occurred between May 10 and 12 last year through the latest satellite and ground observation systems at home and abroad and analyzed how the space weather caused by the solar storm affects the Earth.

The analysis confirms that the G5-grade geomagnetic storm at the time was caused by the strongest-grade X solar flare and multiple coronal mass emissions.

This has resulted in a large influx of energy into the upper atmosphere of Earth's high-altitude, heating the Earth's thermal zone, varying the electron density in the ionosphere, and observing a multicolored aurora from all over the world.

This year is the solar maximum period among solar activities repeated every 11 years, and the solar magnetic field becomes stronger and sunspot activity on the solar surface becomes active, which causes satellite damage, malfunction, GPS error increase, and ground power grid damage.