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auroral$5947$ - translation to ολλανδικά
![Aurora Borealis]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Aurora Borealis by Frederic Edwin Church.jpg?width=200 "Aurora Borealis]]''")
![An animation]] created using the same satellite data is also available.](https://commons.wikimedia.org/wiki/Special:FilePath/Aurora australis 20050911.jpg?width=200 "An animation]] created using the same satellite data is also available.")
![Construction of a [[keogram]] from one night's recording by an all-sky camera, 6/7 September 2021. Keograms are commonly used to visualize changes in aurorae over time.](https://commons.wikimedia.org/wiki/Special:FilePath/Keogram explainer.gif?width=200 "Construction of a [[keogram]] from one night's recording by an all-sky camera, 6/7 September 2021. Keograms are commonly used to visualize changes in aurorae over time.")
![[[Moon]] and aurora](https://commons.wikimedia.org/wiki/Special:FilePath/Moon and Aurora.jpg?width=200 "[[Moon]] and aurora")
![A movie]] shows images from 81 hours of observations of Saturn's aurora.](https://commons.wikimedia.org/wiki/Special:FilePath/Saturns Northern Aurora still.jpg?width=200 "A movie]] shows images from 81 hours of observations of Saturn's aurora.")
![Aurora pictured as wreath of rays in the coat of arms of [[Utsjoki]]](https://commons.wikimedia.org/wiki/Special:FilePath/Utsjoki.vaakuna.svg?width=200 "Aurora pictured as wreath of rays in the coat of arms of [[Utsjoki]]")
Ορισμός
hemisphere, where it is the Aurora Borealis, and seen in the southern heavens in the southern hemisphere, where it is called Aurora Australis, or indifferently for either, the Aurora Polaris. It takes the form of pale luminous bands, rays and curtains varying in color. Near the poles they are very numerous. A French commission observed 150 auroras in 200 days. Their height is variously estimated at from 90 to 460 miles; they are most frequent at the equinoxes and least so at the solstices. There is a secular variation also, they attain a maximum of occurrence every 11 years together with sun spots, with a minimum 5 or 6 years after the maximum. There is also a period of 60 years, coincident with disturbances in the earth's magnetism. Various attempts have been made to account for them. They have a constant direction of arc with reference to the magnetic meridian (q. v.) and act upon the magnetic needle; in high latitudes they affect telegraph circuits violently. There is a strong probability that they represent electric currents or discharges. De la Rive considers them due to electric discharges between the earth and atmosphere, which electricities are separated by the action of the sun in equatorial regions. According to Balfour Stewart, auroras and earth currents.(q. v.) may be regarded as secondary currents due to small but rapid changes in the earth's magnetism. The subject is very obscure. Stewart treats the earth as representing the magnetic core of an induction coil, the lower air is the dielectric, and the upper rarefied and therefore conducting atmosphere is the secondary coil. This makes the aurora a phenomenon of induced currents. Then the sun may be regarded as the instigator of the primary changes in the earth's lines of force representing the primary of an induction coil. [Transcriber's note: Solar wind, streams of electrons and protons, interacting with the earth's magnetic field causes aurora. Neither electrons (1897) nor protons (1920) were known in 1892. The Soviet satellite Luna first measured the solar wind in 1959. Even today increased understanding of solar and auroral phenomenon continues.]
Βικιπαίδεια
Auroral kilometric radiation (AKR) is the intense radio radiation emitted in the acceleration zone (at a height of three times the radius of the Earth) of the polar lights. The radiation mainly comes from cyclotron radiation from electrons orbiting around the magnetic field lines of the Earth. The radiation has a frequency of between 50 and 500 kHz and a total power of between about 1 million and 10 million watts. The radiation is absorbed by the ionosphere and therefore can only be measured by satellites positioned at vast heights, such as the Fast Auroral Snapshot Explorer (FAST). According to the data of the Cluster mission, it is beamed out in the cosmos in a narrow plane tangent to the magnetic field at the source. The sound produced by playing AKR over an audio device has been described as "whistles", "chirps", and even "screams".
As some other planets emit cyclotron radiation too, AKR could be used to learn more about Jupiter, Saturn, Uranus and Neptune, and to detect extrasolar planets.
