At solar maximum, the solar activity is high, and so too the EUV radiation output, which affects the ionosphere. At solar minimum, the opposite is true. The outflow of solar material from the hot, unstable corona. The solar wind blows into interplanetary space with a speed of about 400 km per sec. They contain intense magnetic fields, which provide the energy for solar flares.
Sunspots occur in groups.
Flares, which have a particular range of energy output of X-ray radiation. X class flares are very energetic events which will definitely produce a short-wave fadeout in the daylight hemisphere of the Earth. Another celestial threat that's gotten a lot of press lately is the predicted increase of solar activity expected to take place as the new millennium begins. While most people think the biggest impact the sun has on them is a nasty sunburn, scientists, astronomers and telecommunications professionals know better. The sun's solar cycle generally covers an 11-year period.