magnetic storm

a temporary disturbance of the earth's magnetic field, induced by radiation and streams of charged particles from the sun.
Also called geomagnetic storm, solar storm.

1855–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
magnetic storm
a sudden severe disturbance of the earth's magnetic field, caused by emission of charged particles from the sun

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Main Entry:  magnetic storm
Part of Speech:  n
Definition:  See geomagnetic storm's 21st Century Lexicon
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American Heritage
Science Dictionary
magnetic storm  
A disturbance or fluctuation in the Earth's outer magnetosphere, usually caused by streams of charged particles (plasma) given off by solar flares. The entry of large amounts of plasma into the upper atmosphere results in intense auroral displays and other magnetic phenomena in the polar regions of the Earth. See also aurora.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

magnetic storm definition

The effect on the ionosphere of large bursts of charged particles (see electrical charge) from the sun.

Note: During a magnetic storm, radio reception can become very difficult.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica

magnetic storm

disturbance of the Earth's upper atmosphere brought on by solar flares-i.e., bright eruptions from the visible portion of the Sun's chromosphere. The material associated with these flares consists primarily of protons and electrons with an energy of a few thousand electron volts. Called plasma, this material moves through the interplanetary medium at speeds ranging from 1,000 to 2,000 km (600 to 1,200 miles) per second, so that the ejected material reaches the Earth in approximately 21 hours. The pressure of the incoming plasma is transmitted to the outer edge of the Earth's magnetosphere; this causes an increase in the observed geomagnetic field at the ground, perhaps through hydromagnetic waves

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Solar wind will push the magnetosphere to a dynamic state called a magnetic storm.
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