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,"