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Astrophysics / Plasma physics / Geomagnetism / Planetary science / Light sources / Coronal mass ejection / Space weather / Geomagnetic storm / Aurora / Physics / Space plasmas / Astronomy
Date: 2009-10-26 18:17:29
Astrophysics
Plasma physics
Geomagnetism
Planetary science
Light sources
Coronal mass ejection
Space weather
Geomagnetic storm
Aurora
Physics
Space plasmas
Astronomy

GLOSSARY OF SOLAR-TERRESTRIAL TERMS A a index. See Ak index. aa index. A daily and half-daily index of geomagnetic activity determined from the k indices scaled at two nearly antipodal stations at invariant magnetic lati

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