Solar activity refers to any natural phenomena occurring on or in the Sun, such as:
- Sunspots and the
- Solar cycle
- Solar flares
- Solar wind
- Coronal mass ejection
- Solar variation, the sum of all the periodic and aperiodic solar fluctuations; what is typically referred to when the term "solar activity" is used unqualified
- Space weather, the collective effect of all of the above on animate and inanimate objects in orbit and on the earth
Famous quotes containing the words solar and/or activity:
“Senta: These boats, sir, what are they for?
Hamar: They are solar boats for Pharaoh to use after his death. They’re the means by which Pharaoh will journey across the skies with the sun, with the god Horus. Each day they will sail from east to west, and each night Pharaoh will return to the east by the river which runs underneath the earth.”
—William Faulkner (1897–1962)
“I suspect there isn’t an actor alive who was able to truthfully answer his family’s questions after his first day’s activity in his future profession.”
—Simone Signoret (1921–1985)