NASA and the National Oceanic and Atmospheric Administration (NOAA) have confirmed that the sun has entered a new cycle of solar activity, which began to pick up from its lowest value in December 2019. The cycle of the sun, like a clock, has periods of increase and decrease in activity. From one so-called solar minimum to one solar maximum and then to the next solar minimum, each solar cycle lasts 11 years. NASA and NOAA confirmed at this week’s press conference that a new solar cycle has begun after the last solar minimum was observed in December last year. Although it may seem like late news, these things can’t be announced until enough data is collected. The fluctuation of solar activity is calculated by the number and size of sunspots. These dark spots on the surface of the sun appear in areas with relatively low temperature and high magnetism, and they produce more flares and coronal mass ejections. Fr é D é ric clette, director of the world sunspot index and long-term solar observation data center, said: “we have detailed records of several small sunspots, which mark the beginning and rise of a new cycle. Here’s a small preview of the huge solar fireworks in the future. It’s only by tracking the overall trend for several months that we can determine the critical point between the two cycles. ” Looking to the future, the team said the 25th solar cycle will reach the next maximum cycle around July 2025 and return to the minimum cycle around 2030. It can also be a fairly quiet cycle, even quieter than the size of the previous cycle. < / P > < p > the 24th solar cycle, which began in December 2008, is the weakest solar cycle in about a century. Although the sun certainly has its active moments, the total number of sunspots is far below average – even at the peak of solar activity in April 2014. This has led some scientists to speculate that we are in a “minimum period”, a period of abnormally reduced activity guided by an unknown long-term cycle. < / P > < p > on the bright side, the reduction in solar activity means that future space weather will be more friendly for astronauts, satellites and other spacecraft. However, Doug Biesecker, CO chairman of the center for space weather prediction (SWPC), said: “just because this is a sub average solar cycle does not mean there is no risk of extreme space weather. The influence of the sun on our daily life is real. SWPC is manned 24 hours a year, 365 days a year, because the sun can always give us some predictions. ” Global Tech