Provisional solar and magnetic character‐figures, Mount Wilson Observatory October, November, and December, 1938
Nicholson, Seth B.; Mulders, Elizabeth Sternberg
Журнал:
Terrestrial Magnetism and Atmospheric Electricity
Дата:
1939
Аннотация:
The origin of the storm of October 7–8 is uncertain although it was probably caused by the very large sunspot‐group in latitude 17° north, which was 60° east of the central meridian when the storm began. A chromospheric eruption of intensity 3 occurred at 18<sup>h</sup> 11<sup>m</sup> GMT, December 7, in a sunspot‐group 8° south of the equator and 10° west of the central meridian. At the same time a change occurred in the Earth's magnetic field at Mount Wilson similar to those which are usually caused by these eruptions. At 18<sup>h</sup> 11<sup>m</sup> GMT, H decreased 39 gammas in four minutes, recovering in the next 17 minutes.
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