Magnetic Moments of Sunspots
- 15 February 1949
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 75 (4) , 606-611
- https://doi.org/10.1103/PhysRev.75.606
Abstract
Simple approximate representations of the magnetic fields of sunspots by dipoles or ring currents are considered, and expressions deduced for the magnetic moment of a sunspot in terms of its area and its maximum central magnetic field strength. These are extended to include sunspot groups, and a function (SS-MM) is defined as the arithmetical sum of the equivalent moments of all visible groups. Statistical treatment by Chree's method of superposed epochs provides some indication of a 27-day interval between recurrences of fluctuations in SS-MM.Keywords
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