magnetic substorm onset

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geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… … Universalium
THEMIS — The THEMIS mission uses a constellation of five NASA satellites to study energy releases from Earth s magnetosphere known as substorms, magnetic phenomena that intensify auroras near Earth s poles. The name of the mission is an acronym for Time… … Wikipedia
Aurora (astronomy) — Aurora Borealis redirects here. For other uses, see Aurora Borealis (disambiguation). Aurora Australis redirects here. For the ship, see Aurora Australis (icebreaker). For the book, see Aurora Australis (book). Northern lights redirects here. For … Wikipedia

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