Abstract
In that part of geomagnetic changes associated with solar changes the experts of the Department of Terrestrial Magnetism of the Carnegie Institution of Washington have distinguished two types of change, one associated with short‐wave solar radiation coming from flares visible on the surface of the Sun and the other attributed to electrified particles coming from the Sun. The first kind of disturbance travels with the velocity of light and reaches the Earth in a few minutes after the solar flares are seen. They affect only the sunlit side of the Earth and are principally noticeable in the equatorial regions of the Earth.The second class of disturbance, associated with electrified particles, travels more slowly and effects the sunlit and dark sides of the Earth equally. These disturbances are most felt in the polar regions and when strong are associated with magnetic storms, auroras, and radio interruptions. The corpuscular radiation has been standardized to eliminate local effects and is now published by Science Service for every three hours as deduced from seven observatories scattered around the Earth and are called KA‐values. In addition complete values of K for the year 1938 and 1939 are published in Terrestrial Magnetism and Atmospheric Electricity for September, 1940, as compiled by Bartels, Heck, and Johnston.
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