Global Hydromagnetic Wave Ducts in the Exosphere

Bomke, Hans; Ramm, W. J.; Goldblatt, S.; Klemas, V.

doi:10.1038/185299a0

Cited by 34 publications

(9 citation statements)

References 2 publications

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“…If their effects were localized, micropulsations due to this mechanism would not be observed at low and middle latitudes. However, it has recently been shown by Bomke et al (1960) that magnetic disturbances caused by the Argus high altitude atomic explosions appeared to be propagated horizontally in hydromagnetic ducts between the ionosphere and a height of 2500 kID. Such propagation would also be likely tQ spread micropulsations.…”

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confidence: 99%

Geomagnetic Micropulsations

Ellis¹

1960

Aust. J. Phys.

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SummaryThis paper describes simultaneous observations of geomagnetic micropulsations at three places ranging from 28 0 S. to 51 0 S. geomagnetic latitude. It is shown that there is no observable change in the micropulsation period with latitude although there is a monotonic increase in the amplitude with latitude for all periods between 10 and 100 sec. The interpretation of these results in terms of existing theories is discussed.

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confidence: 99%

Geomagnetic Micropulsations

Ellis¹

1960

Aust. J. Phys.

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“…That such observations have not encouraged a greater amount of work on this source Y X• g. g.g. m oZ• mechanism appears due principally to the predominant effect that propagation is thought to have upon the observed signal characteristics [Berthold et al, 1960;Bomke et al, 1960Bomke et al, , 1964Kahalas, 1965;Kovach and Ben-Menahem, 1966;Field and Greifinger, 1967]. There are some basic inferences concerning the source mechanism for these signals that can be drawn from the data, however.…”

Section: Experimental Results and Their Interpretationmentioning

confidence: 99%

The electromagnetic pulse from nuclear detonations

Price¹

1974

Reviews of Geophysics

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Models of the processes whereby a nuclear detonation emits a coherent electromagnetic pulse fall into three classes: those involving Compton electron currents produced by interaction of prompt γ radiation from the detonation with the environment, those involving photoelectron currents produced by the similar interaction of primary X radiation from the detonation, and those involving perturbation of the ambient magnetic field by the expanding plasma surrounding the detonation point. For each model considered the cause of the asymmetry in the current system necessary for the radiation of a signal is discussed. These causes include the earth‐atmosphere interface, the atmospheric density gradient, anisotropy of the environment by virtue of the presence of the earth's magnetic field, nonuniform emission of the energetic radiation (γ and X rays) by the detonation, and asymmetries of the delivery vehicle and device case. The available experimental data are then examined in the light of the models. These data suffice to establish the models as probably being correct in their identification of the principal processes whereby the nuclear electromagnetic pulse is generated, but they are inadequate for a quantitative assessment of the accuracy of the models.

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“…For the third one the corresponding values were 2-4 sec and 30-40 sec, respectively. BOMKE et al (1960) interpreted the observations of magnetic pulsations after the Argus explosions as showing that the magnetohydrodynamic waves were essentially confined in ducts concentric with the Earth and with inner and outer boundaries at 1700 and 2500 km above the Earth's surface. Troitskaya (1960) found, however, that the onset of the pulsations was simultaneous all over the USSR, a result which is in disagreement with a magnetohydrodynamic interpretation.…”

Section: Magnetohydrodynamic Effects Of Nuclear Explosionsmentioning

confidence: 99%

Plasma waves in the frequency range 0.001 ? 10 cps in the earth's magnetosphere and ionosphere

Hultqvist¹

1966

Space Sci Rev

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The plasma model for the magnetosphere and ionosphere is first discussed. A review of some parts of the theory for a warm collisionless plasma of interest in the magnetosphere in connection with waves of periods between 0.1 and 1000 seconds is given. The theory for magnetohydrodynamic waves in a slightly ionized gas is then summarized. The available observational data about magnetospheric and ionospheric phenomena, which may be interpreted in terms of waves with periods between 0.1 and 1000 seconds, are briefly surveyed and some theoretical applications to the ionosphere and magnetosphere are finally discussed. The theory of shock phenomena and transients in the magnetosphere is not included in the report.

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Global Hydromagnetic Wave Ducts in the Exosphere

Cited by 34 publications

References 2 publications

Geomagnetic Micropulsations

Geomagnetic Micropulsations

The electromagnetic pulse from nuclear detonations

Plasma waves in the frequency range 0.001 ? 10 cps in the earth's magnetosphere and ionosphere

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