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1A natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, usually near the northern or southern magnetic pole.
- ‘This causes the phenomenon called the northern lights, also known as the aurora borealis.’
- ‘In the southern hemisphere, sky watchers saw the aurora australis over New Zealand, Australia, and South Africa.’
- ‘Experts used to think it was just a matter of the air being heated by particles and electric currents in the regions around the poles, where auroras occur.’
- ‘Gaps in the magnetosphere also allow for one of Earth's most beautiful, eerie phenomena: the aurora borealis, or northern lights.’
- ‘Bound to the Earth, our only naturally occurring experience with space weather comes from what we can see with our eyes: eclipses, comets, auroras, and sunspots.’
- ‘He expanded on their work by pulling in historical records of auroras, naked-eye sunspots, and eclipses.’
- ‘Colorful sky lights called auroras may be active at high latitudes and possibly into northern U.S. states and Europe.’
- ‘And then last week another big storm that caused auroras and beautiful geo magnetic activity all over the world.’
- ‘Although the solar wind produces beautiful auroras, it can also cause a variety of undesirable consequences.’
- ‘As it is, auroras on Earth follow magnetic lines of force that converge at the north and south magnetic poles.’
- ‘The Hubble Space Telescope has spotted auroras near the poles of both Saturn and Jupiter.’
- ‘Birkeland's experiments failed to account for one of the most important traits of auroras: they are common around the polar regions but exceedingly rare at the poles themselves.’
- ‘The eventual physical effects of the storm were minimal - auroras were visible in Boston and other northern U.S. cities, but no satellites or power grids had major failures.’
- ‘A typical example of how both missions will co-operate is the study of the magnetic substorms producing the bright aurorae.’
2literary in singular The dawn.daybreak, break of day, crack of dawn, sunrise, first light, daylight, first thing in the morning, early morning, cockcrowView synonyms
Late Middle English (originally in aurora (sense 2)): from Latin, ‘dawn, goddess of the dawn’. aurora (sense 1) dates from the early 18th century.
proper nounRoman Mythology
Goddess of the dawn.Greek equivalent Eos
1A city in north central Colorado, east of Denver; population 319,057 (est. 2008)
2An industrial city in northeastern Illinois; population 171,782 (est. 2008)
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