Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy  A phenomenon in which amagnetotail becomesswollen andunstable .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? 
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? Watts Up With That? 2010 
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? Muti 2009 
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								Scientists already know what causes it: an interaction between the solar wind in the Earth's magnetic field (which is released in what is known as a substorm) and charged particles from space. CTV News RSS Feed 2009 
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								THEMIS (Time History of Events and Macroscale Interactions during Substorms) consists of five identical satellite probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light known as a substorm? 
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? PhysOrg.com - latest science and technology news stories 2009 
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								Led by the University of California astrophysicist Andreas Keiling, scientists have made the most detailed measurements yet of the space tornadoes, also known as substorm current wedges. Latest Articles 2009 
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? R&D Mag - News 2009 
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								Led by the University of California astrophysicist Andreas Keiling, scientists have made the most detailed measurements yet of the space tornadoes, also known as substorm current wedges. unknown title 2009 
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								THEMIS consists of five identical probes launched in 2006 to solve a long-standing mystery: Why do auroras occasionally erupt in an explosion of light called a substorm? PhysOrg.com - latest science and technology news stories 2009 
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