Sunspot Groups of Irregular Magnetic Polarity.
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Group Sunspot Numbers: Sunspot Cycle Characteristics
Solar Physics, 2002We examine the "Group" sunspot numbers constructed by Hoyt and Schatten to determine their utility in characterizing the solar activity cycle. We compare smoothed monthly Group Sunspot Numbers to Zurich (International) Sunspot Numbers, 10.7-cm radio flux, and total sunspot area.
David H. Hathaway +2 more
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We examine daily records of sunspot group areas (measured in millionths of a solar hemisphere or μHem) for the last 130 years to determine the rate of decay of sunspot group areas. We exclude observations of groups when they are more than 60° in longitude from the central meridian and only include data when at least three days of observations are ...
David H. Hathaway, Debi Prasad Choudhary
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On the dissolution of sunspot groups
Solar Physics, 1982The behavior of magnetic fluxes from active regions is investigated for times near sunspot disappearance. It is found that the magnetic fluxes decrease on or near the date the spot vanishes. This effect is investigated and it is concluded that it is actually due to changes in the field, rather than through dissipation of the active region fields.
StevenG. Wallenhorst, Robert Howard
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