Impulse(abbrev. IMPL) Alternate term for Upper Level System and Shortwave; a general term for any large-scale or mesoscale disturbance capable of producing upward motion (lift) in the middle or upper parts of the atmosphere.Sudden Impulse (SI+ or SI-)In solar-terrestrial terms, a sudden perturbation of several gammas
in the northward component of the low-latitude geomagnetic field,
not associated with a following geomagnetic storm. (An SI becomes
an SC if a storm follows.)
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