ASY/SYM: [1981-]
Final AE: [1975 (AE & AL only), 1978-1987, and 1988/01-06]
Provisional AE: [1989/03 and 1990-]
The AE indices for 1988/07-12, 1989/01-02, and 1989/04-12
have not yet been derived.
Provisional AE index for July 2019 - December 2019 is now available.
[January 5, 2024]