Publication Date:
1973-01-01
Description:
Irregular pulsations with periods from 150 to 600 seconds have been observed as enhancements above the average background in the geomagnetic power spectra computed over two-hour intervals from magnetic records taken at Siple, Antarctica (L~4); Durham, New Hampshire (L~3.2); Lac Rebours, Quebec (L~4); and Girardville, Quebec (L~4.5). A study is made of the morphological characteristics of the power enhancements corresponding to these pulsations. The irregular pulsations are compared with the more regular but short-lived (typically 5-10 oscillations) sinusoidal pulsations with periods of 150 to 600 seconds, usually known as Pc5's, which have been studied previously. Some comment is made on the theoretical models proposed for Pc5's as models for the generation of the irregular pulsations. © 1973, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.
Print ISSN:
0022-1392
Topics:
Geosciences
Permalink