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aa References
Copyright WDC C1 for STP at RAL.
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A hundred year series of geomagnetic data 1868 to 1967, indices aa,
storm sudden commencements
IAGA Bulletin 33 page 252, IUGG Publications Office, Paris 1973
Author Mayaud, P.N.
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Derivation, Meaning, and Use of Geomagnetic Indices
AGU (Washington D.C.), 1980.
Author Mayaud, P.N.