Spatial Variations in Geomagnetic Micropulsations

Duffus, H. J.; Kinnear, J. K.; Shand, J. A.; Wright, Charles

doi:10.1139/p62-120

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…The latest review of Canadian experiments on the spatial variations of micropulsations is that of Duffus et al (1962). The micropulsation amplitude effects are very complicated in regions where the local crustal structure becomes complex, but this can be understood in terms of skin-depth arguments.…”

Section: Introductionmentioning

confidence: 99%

Geomagnetic Variation Anomalies in Canada

Whitham

1965

J. geomagn. geoelec

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Anomalies in geomagnetic variations in the Arctic Archipelago are first discussed. The gross characteristics of the Alert (Ellesmere Island) anomaly can be explained by a number of models involving a 100km upheaval of the 1400-1500C isotherm to within 25-30km of the surface. The solution is not unique and may be in error by as much as 60%. However the response parameters most useful have been clearly defined. Where an integrated geophysical approach has been attempted in Canada, no self consistent explanation has yet been found.

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Section: Introductionmentioning

confidence: 99%

Geomagnetic Variation Anomalies in Canada

Whitham

1965

J. geomagn. geoelec

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“…between stations was selected on the basis of work done by other researchers [Duffus et al, 1962;Voelker, 1963;Herron, 1966;Davidson and Heirtzler, 1967]. Micropulsations recorded 500 km and more apart exhibit large differences in appearance and frequency content [Davidson and Heirtzler, 1968;Voelker, 1968;Eleman, 1967;Al'Perovich et al, 1969].…”

Section: Emplacement O• the Sensors The Separationmentioning

confidence: 99%

Spatial characteristics of midlatitude geomagnetic micropulsations

Zelwer¹,

Morrison²

1972

J. Geophys. Res.

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Simultaneous recordings of geomagnetic micropulsations in the 0.001‐ to 1‐Hz frequency range across the state of California were made in late 1967. Two orthogonal horizontal components of the magnetic field were measured at sites located near Berkeley, California, Reno, Nevada, and Fresno, California. The data from the Reno and Fresno sites were telemetered by telephone to the Berkeley site, where they were reported simultaneously with the Berkeley data in analog and digital form. Digital portions of the data were analyzed, and polarization and spectral characteristics were obtained by using a method based on the theory of quasi‐monochromatic or partially polarized radiation. Depending on their spatial characteristics, micropulsations were classified into two basic types, uniform and nonuniform. Uniform micropulsations are in phase and nearly identical in amplitude and wave form at the three sites. They include Pi 1's, Pi 2's, Pc 1's, and quiet‐time Pc 2–4's. The nonuniform micropulsations, which consist primarily of daytime Pc 2–3's, exhibit substantial differences in amplitude, phase, and frequency content between the stations. A striking period increase with latitude was also observed. Examples of both uniform and nonuniform micropulsations are presented here. A reversal of the sense of rotation from counterclockwise in the morning hours to clockwise in the afternoon and evening hours with a transition occurring around noon local mean time was observed for all micropulsations. An attempt to explain the behavior of micropusations in terms of current theories of hydromagnetic wave propagation is made, and evidence for a narrow L‐shell localization of micropulsations is presented.

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“…Lastly, spatial coherence of micropulsations and the perturbing effects of geological structures and land-sea boundaries have been investigated by and Duffus, Kinnear, Shand and Wright (1962). Some symmetry relations in magnetic oscillations at a pair of conjugate points are explained by Sugiura and Wilson (1964).…”

Section: Introductionmentioning

confidence: 99%

A Theory of Geomagnetic Micropulsations I

Sen¹

1968

J. geomagn. geoelec

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Spatial Variations in Geomagnetic Micropulsations

Cited by 9 publications

References 3 publications

Geomagnetic Variation Anomalies in Canada

Geomagnetic Variation Anomalies in Canada

Spatial characteristics of midlatitude geomagnetic micropulsations

A Theory of Geomagnetic Micropulsations I

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