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Sentences for "auroral "
An appearance much resembling the two auroral zones of the earth was produced, on a small scale, by the late Professor Kr.
Evidently the emission from the sun that causes the auroral discharge varies greatly in strength, and this is in accordance with what we know about solar activities in general.
From any distant point on the earth’s surface either north or south of it, the visible portion of the auroral ring presents the appearance of an arch across the horizon.
Observations with the spectroscope seem to show that the light of the aurora is chiefly due to glowing nitrogen, though the most prominent line in the auroral spectrum has sometimes been referred to an unknown atmospheric gas.
Another interesting revelation of the spectroscope is that there is162 apparently, a faint auroral illumination in the sky at all times and in all parts of the world, the so-called “permanent aurora.
The apparent position of the auroral detail among the stars will differ in the two pictures, and a comparison of them makes it possible to determine the actual position of the aurora in space.
A luminous circle formed by the apparent convergence of auroral beams about the place in the sky toward which the dipping-needle points.
It would be interesting to follow up this last 88 named discovery by an endeavour to ascertain whether the fluctuations which are coincident in point of time with an Auroral display depend upon optical considerations connected with the Aurora, or on physical considerations having any relation to the increased development of terrestrial magnetism.
Hind himself, in Middlesex, observed a peculiar phosphorescence or illumination of the sky which he attributed at the time to an auroral glare.
The sky had a yellow auroral glare-like look, and the Sun, though shining, gave but feeble light.
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