Polar Field Strength Data

This section is dedicated to the Sun's polar field strength. Data are taken from the Wilcox Solar Observatory. A 20 nHz low pass filter eliminates yearly geometric projection effects. You can select the date range manually from the dynamic plot and optionally select data from the plot legend below. You can download images of the plots by pressing the save button attached to the right-hand side of the plot. Data are updated about once a month.

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