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,"

Aurora borealis can sometimes produce spectacular explosions of light

Earthbound scientists ask: Why do strong electric fields develop along magnetic-field lines in auroral substorms? These electric fields drive auroral plasma into the atmosphere.

anatomy of an aurora : WITH SOLAR MAXIMUM UPON US, IT'S TIME TO REFLECT ON THE ORIGINS OF THE NORTHERN (AND SOUTHERN) LIGHTS

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