44 citations · 144 across the 4 of their papers we have counts for
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astro-ph.SR2019★ 28 cited
Do the Chinese Astronomical Records Dated AD 776 January 12/13 Describe an Auroral Display or a Lunar Halo? A Critical Re-examination
F. Richard Stephenson, David M. Willis, Hisashi Hayakawa +4
The enhancement of carbon-14 in tree rings around AD 774/775 has generated wide interest in solar activity at that time. The historical auroral records have been examined criticall…
astro-ph.SR2009★ 44 cited
Increasing Lifetime of Recurrent Sunspot Groups within the Greenwich Photoheliographic Results
R. Henwood, S. C. Chapman, D. M. Willis
Long-lived (>20 days) sunspot groups extracted from the Greenwich Photo- heliographic Results (GPR) are examined for evidence of decadal change. The problem of identifying sunspot…