auroral substorm

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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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auroral line
auroral oval
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auroral propagation
auroral region
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auroral substorm
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