Computer Science
Scientific paper
May 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21..831s&link_type=abstract
Planetary and Space Science, Volume 21, Issue 5, p. 831-837.
Computer Science
1
Scientific paper
Related investigations concerning the source and occurrence of Pi 2 micropulsations indicate that (1) Pi 2 peak occurrence is near 2230 LMT, before (after) which the initial disturbance vector orientation is primarily northeast (northwest) in the northern hemisphere; (2) peak occurrence is near 2330 (2030) LMT during intervals of low (high) magnetic activity; (3) also, solar wind pressure is directed at a streaming angle of 188° (165°) during low (high) magnetic activity; (4) Pi 2 rate of occurrence peaks when 1 + <= Kp <= 2-. The diurnal variation of occurrence and of the initial disturbance vector orientation may be caused by a magnetospheric Pi 2 source located near the 2230 LMT meridian. Comparison of Pi 2 peak occurrence time and solar wind variations with magnetic activity indicates possible relationships of the two. The fact that processes generating Pi 2 appear optimum, when 1 + <= Kp <= 2-, is consistent with the inverse relation of the yearly Pi 2 occurrence frequency to solar activity.
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