Origin of Long-period Micropulsations

Details Origin of Long-period Micropulsations Origin of Long-period Micropulsations

Jun 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.218..857p&link_type=abstract

Nature, Volume 218, Issue 5144, pp. 857-858 (1968).

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Scientific paper

Several workers1 have discussed the origin of micropulsations in the geomagnetic field with periods of several minutes. Recently, after the discovery of the magnetospheric tail2, ideas about the origin of these micropulsations have been extended to include the effect of the tail. It has been suggested that the definite and regular shape of the geomagnetic tail will allow hydromagnetic waves of only certain discrete frequencies to propagate, which may appear as micropulsations3. A simple double-cylinder waveguide model4 of the tail allows the propagation of 3.3, 20 and 30 min periods. Another model5 of theta geometry also explains some long period micropulsations originating from the magnetospheric tail. It seems that many of the long periods, such as the 20 and 30 min periods discovered long ago in the geomagnetic field data, can now be explained by these models3,4. Indeed, one possible source for the generation of these micropulsations is the magnetospheric tail.

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