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Chapman, S. C., McIntosh, S. W., Leamon, R. J. and Watkins, N. W. ORCID: 0000-0003-4484-6588 (2021) The sun's magnetic (Hale) cycle and 27 day recurrences in the aa Geomagnetic Index. Astrophysical Journal, 917 (2). ISSN 0004-637X
Chapman, S. C., McIntosh, S. W., Leamon, R. J. and Watkins, N. W. ORCID: 0000-0003-4484-6588 (2020) Quantifying the solar cycle modulation of extreme space weather. Geophysical Research Letters, 47 (11). ISSN 0094-8276