Word: sunspots
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Research has conclusively demonstrated that sunspots are huge solar cyclones, whirlwinds in the solar atmosphere, accompanied by pronounced magnetic conditions, according to Andrews. Each sunspot, assumedly as the result of the whirling of electrically charged particles within it, is a huge magnet...
...rotation of the sun on its axis in a period of some 25 days prevents the earth's being constantly in the range of a sunspot or sunspot group, and so we look for the evidence of a terrestrial effect when a spot lies near the centre of the sun as seen from the earth. When this state of affairs is valid such terrestrial phenomena as auroral displays, magnetic storms, and effects on long distance radio reception should occur, for they depend upon the electrical conditions of the atmosphere; and indeed our expectations are fulfilled...
Again, 1917 was a year of great sunspot activity. 1923 and 1933, low point of the depression, were noteworthy for minimum solar disturbance...
...particular correlation which Andrews and others have sought to establish is that between sunspot activity and stock market transactions...
Stimulus for Andrews' review of sunspots comes from a letter asking for a list of sunspot maximum and minimum dates running back to 1850. A table lists them to 1610, in which time the longest period of intermission has been 15 years and the shortest...