Aurora Borealis - also known as the northern lights - The luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centred around the earth's magnetic poles.
Aurora borealis A luminous phenomenon in the night sky consisting of overlapping curtains of greenish-white light, sometimes fringed with pink, appearing in the ionosphere of high latitudes.
Aurora Borealis
(Northern Lights) Aurora of the Northern Hemisphere.
Avalanche
Mass of snow and ice falling suddenly down a mountain slope and often taking with it earth, rocks, and rubble of every description.
Aurora Borealis - the name for the aurora of the northern latitudes
Autumn - The season of the year that is the transition period from summer to winter, occurring as the sun approaches the winter solstice.
Aurora borealis- A colorful, glowing display in the sky caused when particles from the sun strike oxygen and nitrogen atoms in the ionosphere; also called the Northern Lights.
Barometer- An instrument used to measure changes in air pressure.
Aurora Borealis - It's often called the "northern lights". It occurs 50 to 100 miles above the earth, when energetic particles from a solar storm cause the gases in the upper atmosphere to glow. Auroras can last between a few minutes to several hours.
Aurora Borealis
Main article: Space weather
Weather is not limited to planetary bodies. A star's corona is constantly being lost to space, creating what is essentially a very thin atmosphere throughout the Solar System.
Common name for Aurora Borealis; the luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centred around the earth's magnetic poles.
AuroraA faint visual phenomenon associated with geomagnetic activity, which occurs mainly in the high-latitude night sky; typical auroras are 100 to 250 km above the groundAurora AustralisSame as Aurora Borealis, ...
Aurora Borealis: Northern Lights.
Automated Weather Report: A weather observation (REPORT) taken by an automatic weather station.
Autumn Equinox: Occurs on or about September 21.
Unusual atmospheric phenomena such as sun dogs, halos, rainbows, aurora borealis, lenticular clouds, and stories about a long-term dry/cold/wet/warm spell, ...
This may include: unusual atmospheric phenomena such as sun dogs, halos, rainbows, aurora borealis, lenticular clouds, and stories about a long-term dry/cold/wet/warm spell. 2) Public educational information and activities, ...
aurora: appears as greenish-white and sometimes pink light in the night sky over the middle and high latitudes. Called the aurora borealis in the Northern Hemisphere and the aurora australis in the Southern Hemisphere.
aurora—A luminous, radiant emission over middle and high latitudes confined to the thin air of high altitudes and centered over the earth's magnetic poles. Called “aurora borealis' (northern lights) or “ ...
Aurora Glowing light display in the nighttime sky caused by excited gases in the upper atmosphere giving off light. In the Northern Hemisphere it is called the aurora borealis (northern lights); in the Southern Hemisphere, ...
Aurora - A bright and ever changing display of light caused by solar radiation interacting with the upper atmosphere in the region of the poles. It is called aurora borealis in the Northern Hemisphere and aurora australis in the Southern ...
1) A current or expected nonhazardous event of general interest to the public that can usually be covered with a single message (e.g., unusual atmospheric phenomena such as sun dogs, halos, rainbows, aurora borealis, lenticular clouds, ...
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Anticyclonic Rotation, Aurora Australis, Aurora Borealis, Coriolis force, Northern Lights, NRN
Also listed in ...
Auroras are related to magnetic storms and the influx of charged particles from the Sun. The phenomena are called aurora borealis in the Northern Hemisphere and aurora australis in the Southern Hemisphere.
A glowing light display in the night-time sky caused by excited gases in the upper atmosphere. In the Southern Hemisphere it is called the Aurora Australis or Southern Lights, in the Northern Hemisphere Aurora Borealis (Northern Lights).
Autumn ...
It is seen as a bright display of constantly changing light near the magnetic poles of each hemisphere. In the Northern Hemisphere, it is known as the aurora borealis or Northern Lights, and in the Southern Hemisphere, ...
energized by this process, sent along the magnetic field lines towards Earth's upper atmosphere, excite the gases present in the upper atmosphere and cause them to emit light which we call the auroras. The auroras are the northern (aurora borealis) ...
Northern LightsCommon name for Aurora Borealis; the luminous, radiant emission from the upper atmosphere over middle and high latitudes, and centred around the earth's magnetic poles.
In the Northern Hemisphere, it is known as the aurora borealis or Northern Lights, and in the Southern Hemisphere, this phenomena is called the aurora australis.
 See also: High, Light, Norther, Earth, Weather
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