The classification and possible origin of geomagnetic micropulsations are discussed. In particular, pearls are described in some detail and previous investigations reviewed.
Records from Victoria and Resolute Bay, Canada; Uppsala, Sweden; Reykjavik, Iceland; Huancayo, Peru; Ruth, Nevada and Isabella and Palomar, California are examined and the times of commencement and termination of pearl activity determined.
The conclusion is reached that pearls in mid-latitudes are local mean time dependent and tend to occur during two periods of the day. These periods correspond roughly to sunrise and sunset, the times of rapid change in the critical frequency in the Fâ layer. Pearls seem to occur most often when the geomagnetic Kp index is less than 4o and greater than 0â. No correlation is evident between occasional pearl-like signals at Huancayo and pearls observed at other stations.
It is suggested that the appearance of pearls is to a certain extent controlled by local ionospheric conditions. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/39492 |
| Date | January 1962 |
| Creators | Jolley, Edmund Joseph |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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