Abstract
Photospheric magnetic fluxes and average field strengths have been measured beneath 33 coronal holes observed on 63 occasions during 1975–1980. The principal result is that low-latitude holes contained 3 times more flux near sunspot maximum than near minimum despite the fact that their sizes were essentially the same. Average magnetic field strengths ranged from 3–36 G near sunspot maximum compared to 1–7 G near minimum. Evidently the low-latitude coronal holes received a proportion of the extra flux that was available at low latitudes near sunspot maximum.
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Visiting Astronomer, KPNO.
Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.
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Harvey, K.L., Sheeley, N.R. & Harvey, J.W. Magnetic measurements of coronal holes during 1975–1980. Sol Phys 79, 149–160 (1982). https://doi.org/10.1007/BF00146979
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DOI: https://doi.org/10.1007/BF00146979