The strength of the sun's polar fields

Details The strength of the sun's polar fields The strength of the sun's polar fields

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..225s&link_type=abstract

Solar Physics, vol. 58, July 1978, p. 225-239. Research supported by the Max C. Fleischmann Foundation

Physics

108

Field Strength, Polar Caps, Solar Magnetic Field, Coronal Holes, Interplanetary Magnetic Fields, Magnetic Flux, Magnetometers, Solar Activity Effects, Solar Cycles, Solar Limb, Sunspots

Scientific paper

The magnetic field strength within the polar caps of the sun is an important parameter for both the solar activity cycle and for our understanding of the interplanetary magnetic field. Measurements of the line-of-sight component of the magnetic field generally yield 0.1 to 0.2 mT near times of sunspot minimum. This paper reports measurements of the polar fields made at the Stanford Solar Observatory using the Fe I line at 525.02 nm. It is found that the average flux density poleward of 55 deg latitude is about 0.6 mT peaking to more than 1 mT at the pole and decreasing to 0.2 mT at the polar cap boundary. The total open flux through either polar cap thus becomes about 3 x 10 to the 14th Wb. It is also shown that observed magnetic field strengths vary as the line-of-sight component of nearly radial fields.

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