Effects of Sun Spots and Terrestrial Magnetism on Long-Distance Reception of Low-Frequency Waves

Daily average variations of sun spots and field intensity are not simply related. What mostly occurs are the effects which vary as the period of the sun's rotation and one-half thereof. Phase relations are generally found in about 180 degrees and 90 degrees. There is no indication of different effects between daylight and darkness waves. The relation between their monthly average variations is, in general, not obvious. However, direct relation is observed on some stations in summer, whereas inverse relation is noted in winter in several cases, the relation being less clear in the latter season. Daily average variations of terrestrial magnetism and field intensity are also not simply related. However, field intensity usually reaches its maximum from two to four days before the day of occurrence of magnetic disturbance and then gradually decreases until it reaches its minimum from two to four days after that day. There is also no indication of different effects between daylight and darkness waves. The relation is not clearly found for monthly average variations.