The total size of the emission region was about 30 km across, and possibly about 8 km high. A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Sometimes it assumes a wavy appearance, and the streams of light are then called merry dancers. Balfour Stewart (1860–1862). Aurora borealis (�), i. e., northern daybreak; popularly called northern lights. morning. The solar wind speed is greatest – by about 50 km/s, on average – around 5 September and 5 March when Earth lies at its highest heliographic latitude. Fu, C. T. Russell , P. Song, K. K. Khurana, and H. J. Other mechanisms have also been proposed, in particular, Alfvén waves, wave modes involving the magnetic field first noted by Hannes Alfvén (1942), which have been observed in the lab and in space. 221 Aurora Synonyms and 28 Aurora Antonyms in Aurora Thesaurus. Feldstein, Y. I. By using our services, you agree to our use of cookies. The charged particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth's magnetic field into the atmosphere. Because the very top of the atmosphere has a higher percentage of oxygen and is sparsely distributed such collisions are rare enough to allow time for oxygen to emit red. A luminous meteoric phenomenon, visible only at night, and supposed to be of electrical origin. Chao, H .C. "Eyewitness reports of the great auroral storm of 1859". Behind it is pink, a mixture of light green and red, followed by pure red, yellow (a mixture of red and green), and lastly, pure blue. Some O+ ions ("conics") also seem accelerated in different ways by plasma processes associated with the aurora. The aurora borealis or aurora australis (northern or southern lights). [36] Film and digital exposure to auroral displays is fraught with difficulties, particularly if faithfulness of reproduction is an objective. (1973). E. Auroras (�), L. (rarely used) Auroræ (�). The northern lights have had a number of names throughout history. ○ Lettris Venusian auroras are produced by the impact of electrons originating from the solar wind and precipitating in the night-side atmosphere. By analyzing a map of crustal magnetic anomalies compiled with data from Mars Global Surveyor, scientists observed that the region of the emissions corresponded to an area where the strongest magnetic field is localized. Each square carries a letter. break of day, break of the day, cockcrow, dawn, dawning, daybreak, daylight, dayspring, first light, morning, red morning sky, rising, sunrise, twilight, sunup (colloquial, American), ↘ at break of day, at dawn, at first light, at the crack of dawn, auroral, aurorean, cock-crow, with the birds ≠ sundown, sunset, aurora australis • aurora borealis • aurora waxbill, (dew), (dawn; morning; morn; morning time; forenoon), (soon; early)[Thème], deity, divinity, god, immortal - classical mythology[Hyper. Balfour Stewart, in a paper [22][23] to the Royal Society on 21 November 1861, described both auroral events as documented by a self-recording magnetograph at the Kew Observatory and established the connection between the 2 September 1859 auroral storm and the Carrington-Hodgson flare event when he observed that "it is not impossible to suppose that in this case our luminary was taken in the act." Add new content to your site from Sensagent by XML. Portland: "Better than with our batteries on. an offensive content(racist, pornographic, injurious, etc. Eco, Cookies help us deliver our services. In the radiation belts of Earth, once particles on such trajectories are gone, new ones only replace them very slowly, leaving such directions nearly "empty". A luminous meteoric phenomenon, visible only at night, and supposed to be of electrical origin. The magnetospheric plasma has an abundance of electrons: some are magnetically trapped, some reside in the magnetotail, and some exist in the upward extension of the ionosphere, which may extend (with diminishing density) some 25,000 km around Earth. The magnetosphere is full of trapped plasma as the solar wind passes the Earth. The currents from it change coming on the wires, and then disappear: the mass of the aurora rolls from the horizon to the zenith.[29]. All rights reserved. Aurora borealis from the International Space Station, Aurora during a geomagnetic storm that was most likely caused by a coronal mass ejection from the Sun on 24 May 2010.
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