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During observations with the spectrohelioscope at the Huancayo Magnetic Observatory April 8, 1936, there occurred the most spectacular sunspot‐eruption, from the viewpoint of extent and intensity, that had been witnessed over a period of a year of observing there. The usual second period of observation (in accordance with the program of Commission No. 11 of the International Astronomical Union as arranged at the Paris meeting held in 1935) began at 16<sup>h</sup> 30<sup>m</sup> G.M.T., and to within a minute or two of seeing the phenomena about to be described, nothing unusual had been noticed. At 16<sup>h</sup> 45<sup>m</sup>, activity was first noticed surrounding the largest sunspot of a group of about six, located at approximately 23° north and 10° west of the central meridian. This increased in brightness until 16<sup>h</sup> 47<sup>m</sup>, reaching intensity “2,” and soon after, activity was noticed about three other smaller sunspots in the group, although rather mild in comparison with the first‐mentioned activity. Around 16<sup>h</sup> 50<sup>m</sup> the flocculus about the largest sunspot appeared to slowly decrease in size, but retained its great brilliancy. Before disappearing, the flocculus about the largest sunspot assumed the shape of a quite perfect crucifix. By 17<sup>h</sup> 03<sup>m</sup> the flocculi about all of the sunspots had returned to their original appearance. |
