Sudden commencement absorption at 2144 UT, June 17, 1965, was observed with two groups of conjugate riometers separated by approximately 100° in magnetic longitude. The location of the region of maximum precipitation occurred in the local afternoon hours. From closely spaced riometers in the midnight sector, evidence is presented indicating that the triggering of magnetospheric substorms by sudden commencements is highly structured.
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Brown et al. (1972) studied this question.
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