Physics
Scientific paper
Jun 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..413j&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 6, pp. 413-414, IN1, 415-434
Physics
19
Scientific paper
The exospheric region below an altitude of about 2000 km, where the Alfvén velocity has a very steep upward gradient, amplifies hydromagnetic waves coming from outer space with certain special periods. The longest characteristic period, corresponding to the fundamental mode, is of the order of from 1 to several seconds, which is comparable to the period of that particular group of geomagnetic micropulsations called pearls. The fundamental period has a frequency-width of the order of 0.02-0.08 sec-1 which is of the right order of the time-scale of fluctuations of the envelope of the pearls. The amplifying ratio also gives the correct order of magnitude of the intensity of pearls as observed at the earth's surface.
Jacobs John Arthus
Watanabe Ta.
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