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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

When solar activity surges, electron density in the ionosphere can rise significantly.

From Science Daily • Feb. 24, 2026

In November 2015, solar activity disrupted air traffic control, leading to chaos in Sweden and some other European airports.

From BBC • Nov. 30, 2025

Spectacular displays of auroras at abnormally low latitudes were expected again Wednesday night into Thursday, a result of intense solar activity which also carries risks to communication networks.

From Barron's • Nov. 13, 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.