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solar activity
noun
- the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.
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Example Sentences
Though the sky might be clear, there’s no solar activity happening.
In the 17th century, Galileo was among the first to spy sunspots, slightly cooler areas on the sun’s surface with strong magnetic fields that are often a precursor to more intense solar activity.
These data suggested the solar activity was at a minimum at the time.
The team compared the dates of the magnetic event with previous records from ice cores that can reflect changes in solar activity.
More significant are “grand solar minima,” decades-long periods of reduced solar activity that have occurred 25 times in the last 11,000 years.
Other natural climate variations include solar activity and volcanoes.
The eclipse of 1883 was at a time of rapidly decreasing solar activity, yet the Corona had the features of a Sun-spot maximum.
As to causes, variations in solar activity are naturally receiving attention, and the results thus far are promising.
That figure, it will be recalled, shows what happens to precipitation when solar activity is increasing.
The degree of solar activity would have much to do with the final extent of the ice sheets.
In this connection, however, it must be remembered that solar activity may arise in various ways, as will appear more fully later.
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