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solar activity

American  

noun

Astronomy.

  1. the sum of all variable and short-lived disturbances on the sun, as sunspots, prominences, and solar flares.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Northern Lights were seen in the UK again on Monday night following an increase in solar activity over the last few days.

From BBC • Mar. 24, 2026

The mission made significant discoveries, including the first data that show the existence of a transient third radiation belt, which can form during times of intense solar activity, Nasa said.

From BBC • Mar. 10, 2026

The model connects space weather and seismic activity without claiming that solar activity directly causes earthquakes.

From Science Daily • Feb. 24, 2026

Since launch, it has provided an almost unbroken record of solar activity spanning nearly three full 11-year solar cycles.

From Science Daily • Dec. 3, 2025

His launch had been delayed due to various technical problems and high solar activity.

From "Women in Space" by Karen Bush Gibson

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.