Solar Radiation
What is solar radiation
The Sun is not just a big bright ball. It has a complicated and changing magnetic field, which forms things like sunspots and active regions.
What is solar activity?
The sun is a magnetic star that on time constantly changes on scales ranging from a fraction of a second to billions of years. Solar flares, coronal mass ejection, high speed solar wind, and solar energetic particals are all forms of solar activities. All solar activities is driven by the solar magnetic field.