|Available|| 1-hour (UT) interval: from 1957 to 1965 (only AE); from 1966 to 1975
1-minute (UT) interval: 1975 (only AE and AL); from 1978 to June 1988;
March 1989; from 1990 onwards
|Type of index||Auroral index horizontal component disturbances|
|Purpose||To monitor the magnetic signature of the eastward and westward auroral electrojets in the Northern hemisphere.|
|Network||Made of 12 observatories in the Northern auroral zone.
(see list of actual and previous AE magnetic observatories)
|Derivation||The magnetograms of the horizontal components from the AE stations are superimposed (*): the upper envelope
defines the AU index, and the lower envelope define the AL index; then AE = (AU - AL) and AO = (AU + AL)/2.
(*) More specific and detailed information may be found on the WDC for Geomagnetism - Kyoto website devoted to AE.
|ISGI Collaborating Institute||WDC for Geomagnetism - Kyoto, Japan|
|IAGA endorsed||IAGA Bulletin 27, 1969, p.123, resolution 2|
|Origin of name||Name "AE" came from "Auroral Electrojet"|
|Historical references||• Davis, T. N., and M. Sugiura (1966) - Auroral electroject activity index AE and its universal time variations, J. Geophys. Res., 71, 785-801, DOI:10.1029/JZ071i003p00785.|