2.2.6 spase://CDPP/NumericalData/AMDA/Indices/Ground_Based/ground-based-aei auroral electrojet 2018-06-21T10:48:29Z AE/AL/AU indices are taken from the WDC (World Data Center) at Kyoto. FINAL 1975 (AE and AL only) 1978 - Jun., 1988 March, 1989 1990 - Feb., 2018 DEFINITIVE: 1975 - 1988 PROVISIONAL: 1989 - 2018 PrincipalInvestigator spase://SMWG/Repository/CDPP/AMDA Online Open AMDA at CDPP http://amda.cdpp.eu Text WDC Kyoto spase://CDPP/Instrument/AMDA/Indices/Ground_Based MagneticField 1975-01-01T00:00:00Z 2017-06-30T23:59:00Z PT1M Earth.NearSurface.AuroralRegion AE ae Auroral Electrojet (AE = AU - AL) nT AU au Auroral Electrojet Upper envelope nT AL al Auroral Electrojet Lower envelope nT AO ao Auroral Electrojet (AO = (AU + AL) / 2) nT