solar activity

American  

noun

Astronomy.

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

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Example Sentences

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

One recent example occurred in February 2022, when 38 of 49 Starlink satellites belonging to US space company SpaceX were lost just two days after launch due to heightened solar activity.

From Science Daily • Jan. 13, 2026

Today, numerous satellites monitor the Sun, measuring the solar wind and the energy it emits, giving us a better understanding of solar activity and earlier warnings when it increases.

From BBC • Dec. 28, 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

That and the solar activity caused high temperatures in the capsule, and he had to return early.

From "Women in Space" by Karen Bush Gibson