substorm

noun
sub·​storm | \ ˈsəb-ˌstȯrm How to pronounce substorm (audio) \

Definition of substorm

: a disturbance in the magnetosphere that manifests as increased activity in the aurora (see aurora sense 3) and that is caused by an influx of high-energy particles from the sun (as from a solar flare) Even when the sun is being well behaved, parcels of plasma shoot sporadically toward Earth's dark side, prompting a bright aurora and intensifying radiation belts. These events, called substorms, last only a few hours, but they occur several hundred times a year and are quite capable of disrupting satellites …— Tim Beardsley

Examples of substorm in a Sentence

Recent Examples on the Web Ninety seconds after the satellites sensed the substorm starting, ground observatories witnessed a Northern Lights display suddenly brighten and dance. Brandon Keim, WIRED, 24 July 2008

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'substorm.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of substorm

1961, in the meaning defined above

Keep scrolling for more

Learn More About substorm

Time Traveler for substorm

Time Traveler

The first known use of substorm was in 1961

See more words from the same year

Dictionary Entries Near substorm

substitutive

substorm

substory

See More Nearby Entries 

Statistics for substorm

Cite this Entry

“Substorm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/substorm. Accessed 5 Aug. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!