Magnetic storm: Difference between revisions

Revision as of 17:24, 14 August 2018

magnetic storm

A worldwide disturbance in the Earth's magnetic field. These storms result from variations in the solar wind that produce major changes in the currents, plasmas, and fields in Earth's magnetosphere. They can last from several hours to many days. The largest storms often result from coronal mass ejections (CMEs), while coronal hole high-speed streams (CH HSS) and co-rotating interaction regions (CIRs) can also lead to periods of storming. Geomagnetic activity is normally measured by surface-based magnetometers and quantified by several indexes to include the commonly used Kp index and storm levels classified with use of the National Oceanic and Atmospheric Administration G-Scale.

GFZ German Research Centre for Geosciences, 2018: Frequently asked questions regarding geomagnetism: What is a geomagnetic storm? Accessed 13 August 2018. Available at https://drive.google.com/drive/folders/1-8fke2lVfJUoXN5wBdBzWs06El8QXETO.

Space Weather Prediction Center, 2018: Geomagnetic storms. Accessed 14 August 2018. Available at https://www.swpc.noaa.gov/phenomena/geomagnetic-storms.

Term edited 14 August 2018.

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    <div class="term">
 == magnetic storm ==
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-<div class="definition"><div class="short_definition">(''Or'' geomagnetic storm.) A worldwide [[disturbance]] of the earth's [[magnetic field]].</div><br/> <div class="paragraph">Magnetic storms are frequently characterized by a sudden onset, in which the magnetic field  undergoes marked changes in the course of an hour or less, followed by a very gradual return to  normalcy, which may take several days. If extreme enough, they may interfere with the operation  of electrical power lines and the operation of artificial satellites. Magnetic storms are caused by  solar disturbances, though the exact nature of the link between the solar and terrestrial disturbances  is not totally understood. They are more frequent during years of high [[sunspot number]]. Sometimes  a magnetic storm can be linked to a particular [[coronal mass ejection]]. In these cases, the time  between the ejection and onset of the magnetic storm is about one or two days. When these  disturbances are observable only in the [[auroral zones]], they may be termed polar magnetic storms.  <br/>''See also'' [[M-region]].</div><br/> </div>
-</div>
+<div class="definition"><div class="short_definition">A worldwide disturbance in the Earth's magnetic field. These storms result from variations in the [[solar wind]] that produce major changes in the currents, [[plasma|plasmas]], and fields in Earth's [[magnetosphere]]. They can last from several hours to many days. The largest storms often result from [[coronal mass ejection|coronal mass ejections]] (CMEs), while [[coronal hole]] high-speed streams (CH HSS) and [[Co-rotating Interaction Region|co-rotating interaction regions]] (CIRs) can also lead to periods of storming. Geomagnetic activity is normally measured by surface-based [[magnetometer|magnetometers]] and quantified by several indexes to include the commonly used [[Kp index]] and storm levels classified with use of the National Oceanic and Atmospheric Administration G-Scale.</div><br/></div>
+<p>GFZ German Research Centre for Geosciences, 2018: Frequently asked questions regarding geomagnetism: What is a geomagnetic storm? Accessed 13 August 2018. Available at <nowiki>https://drive.google.com/drive/folders/1-8fke2lVfJUoXN5wBdBzWs06El8QXETO</nowiki>.</p>
+<p>Space Weather Prediction Center, 2018: Geomagnetic storms. Accessed 14 August 2018. Available at <nowiki>https://www.swpc.noaa.gov/phenomena/geomagnetic-storms</nowiki>.</p><br/>
+<p>''Term edited 14 August 2018.''</p>
 {{TermIndex}}