Abstract
During April (and also March) the Earth's magnetic field was remarkably calm for an equinoctial month in which very large spots were present on the Sun. Although the huge complex bipolar group, No, 8478, which crossed the solar disk from March 30 to April 14, covered a large area and had complex magnetic fields, it produced only a few flares, all of those observed at Mount Wilson being small. This group, a return of the large spot of March, was the largest ever recorded, even surpassing the great group of February, 1946.The magnetic storm of April 8–9 occurred when the great group was 1.8
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