auroral substorm

auroral substorm

[ə′rȯr·əl ′səb‚stȯrm]
(geophysics)
A characteristic sequence of auroral intensifications and movements occurring around midnight, in which a rapid poleward movement of auroral arcs produces a bulge in the auroral oval.
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According to THEMIS project scientist Dave Sibeck of NASA's Goddard Space Flight Center, Greenbelt, Maryland, "By putting together data from ground-based cameras, ground-based radar, and the THEMIS spacecraft, we now have a nearly complete picture of what causes explosive auroral substorms,"
The Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission plans to unravel the mystery behind auroral substorms, magnetic energy powered by the solar wind that intensifies the northern and southern lights.