Paisaxe e cultura

Parker, Kelvin M.; Pedrayo, Ramón Otero

doi:10.2307/40095631

Cited by 2 publications

(1 citation statement)

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“…It can be shown (Parker, 1956) that a highly conducting gas cloud encysted in a large-scale magnetic field is unstable and will either flatten or split into smaller and smaller fragments until the dimension 1 is so small that the time of diffusion •l'#• into the magnetic field is as small as we please. Thus, no matter how large may be the electrical conductivity, •, the cloud gas will rapidly diffuse into the geomagnetic field, once the cloud comes to rest, because of the sequence of splitting which occurs.…”

Section: If We Conclude That the Decrease Of The Horizontal Componentmentioning

confidence: 81%

On the geomagnetic storm effect

Parker¹

1956

J. Geophys. Res.

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The 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. It becomes necessary to adopt a purely hydromagnetic approach wherein one focuses his attention only on the magnetic lines of force of the geomagnetic field and their displacement with the conducting gas surrounding Earth. From the hydromagnetic point of view, a decrease of the horizontal component is brought about by lifting the lines of force in the region above the observer. It is suggested that heating in the upper atmosphere may produce the necessary lifting; this model, along with another, is developed quantitatively to show that lifting the lines of force a distance of only 5 km will produce a decrease in the horizontal component of 0.2 per cent at the equator.

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Section: If We Conclude That the Decrease Of The Horizontal Componentmentioning

confidence: 81%