Results 171 to 180 of about 241,838 (223)
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On the cause of geomagnetic storms
Journal of Geophysical Research, 1974A study of the solar wind and interplanetary magnetic field during four geomagnetic storms shows that strong southward interplanetary magnetic fields are associated with the development of each main phase. Weak southward magnetic fields do not necessarily lead to an increase in the ring current even though such southward fields persist.
Christopher T. Russell +2 more
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Bracing for the geomagnetic storms
IEEE Spectrum, 1990As solar activity moves toward an 11 year peak, utility engineers are girding for the effects of massive magnetic disturbances. The nature of the geomagnetic disturbances is examined. The way in which geomagnetically induced current (GIC) affects power systems is explained.
J.G. Kappernman, V.D. Albertson
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Studies on geomagnetic storm in relation to geomagnetic pulsation
Journal of Geophysical Research, 1958The existence of the earth's outer atmosphere, of which hydromagnetic oscillations forced by the corpuscular stream would give rise to geomagnetic pulsations, suggests the usefulness of studying the geomagnetic storm in relation to the geomagnetic pulsation, and, further, of improving the Chapman-Ferraro theory of the geomagnetic storm.
Y. Kato, T. Watanabe
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Geomagnetic Index for Intense Ionospheric Storm
2019 Russian Open Conference on Radio Wave Propagation (RWP), 2019© 2019 IEEE. From analysis of the geomagnetic activity indices aa and ap it is obtained that the index aa can be more adequate indicator of geomagnetic activity for the ionospheric parameters at periods of maxima of intense magnetic storms than ap. This is supported by analysis of the F2-layer critical frequency over Irkutsk station at the period of ...
Deminov M., Deminov R.
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On the geomagnetic storm effect
Journal of Geophysical Research, 1956The high electrical conductivity of the region surrounding Earth, inferred from the observations of atmospheric whistlers and the zodiacal light, requires abandoning the customary models for producing a geomagnetic storm field with impressed current system.
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Dynamics of the geomagnetic storm
Space Science Reviews, 1962This paper is intended as a critical review of current ideas concerning the mechanisms responsible for the geomagnetic storm. The dynamical theory of the geomagnetic storm phenomenon is formulated as a problem in elasticity. The observed variations in the field are the strains produced by particle stresses exerted by gases in interplanetary space, by ...
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Extreme Geomagnetic Storms – 1868 – 2010
Solar Physics, 2016We present the first large statistical study of extreme geomagnetic storms based on historical data from the time period 1868 - 2010. This article is the first of two companion papers. Here we describe how the storms were selected and focus on their near-Earth characteristics.
Vennerstrom, S. +10 more
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Geomagnetic storms and substorms
Reviews of Geophysics, 1975This report is divided into two main parts corresponding roughly to observations and interpretations. The observation section is subdivided into papers concerned with the solar wind, geomagnetic tail, the magnetosphere, and the ionosphere and atmosphere. These regions are of course interdependent, and the boundaries between them are not sharp. However,
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Journal of Geophysical Research, 1960
A discussion of the two-gas theory of the transmission of geomagnetic disturbances through the atmosphere (to several earth radii) is extended, with the following results: (i) The central problem concerning the main phase of a geomagnetic storm is the mechanism of penetration of solar ions into the geomagnetic field.
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A discussion of the two-gas theory of the transmission of geomagnetic disturbances through the atmosphere (to several earth radii) is extended, with the following results: (i) The central problem concerning the main phase of a geomagnetic storm is the mechanism of penetration of solar ions into the geomagnetic field.
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On the geomagnetic storm effect
Journal of Geophysical Research, 1957In a recent paper,1 an objection was raised against the “ring-current” hypothesis of geomagnetic storm effects, and an alternative hypothesis based on atmosphere displacements was advanced. The objection arose from the unacceptable delay, estimated at 87 days, required for the passage of the storm through the outer reaches of the earth's atmosphere ...
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