Aurora borealis

Nordhftuser Schwefelsaure, Nordhftuser Vitri-oloL Nordhausen acid (fuming sulfuric acid), nordisch, a. northern, northerly, Nordic, nordlich, a. northerly, northern, arctic. Nord-licht, n. aurora borealis, -meer, n. Arctic Ocean, -ost, m. northeast northeaster, -pol, m. north pole. -see,/. North Sea. Norgeraniumsaure,/. norgeranic acid. Norgesalpeter, m. Norway saltpeter (calcium nitrate). 

Fireworks displays are fascinating to watch. Neon lights and sodium vapor lamps can transform the skyline of a city with their brilliant colors. The eerie phenomenon of the aurora borealis is an unforgettable experience when you see it for the first time. All of these events relate to the generation of light and its transmission through space. 

The Early Period. Luminescent phenomena such as the aurora borealis, phosphorescence of the sea, luminous animals and insects, and phosphorescent wood were the earliest of spectral observations because th require nothing more than the... 

The aurora borealis, a spectacular atmospheric light show shown in Figure 7-25. originates in the thermosphere. In addition to electromagnetic radiation, the sun emits a steady stream of protons and electrons. The Earth s magnetic field deflects most of these particles, but some reach the thermosphere above the north and south poles of the... 

The aurora borealis is due to the emission of photons by excited-state atoms and molecules in the thermosphere, hi the Northern Hemisphere, the aurora is called the Northern Lights. 

Figure 12.3.2 The aurora borealis over northwestern Canada. From Masterton and Hurley, Chemistry Principles and Reactions, 4th edition. Orlando Harcourt, 2001. Photo courtesy of George Lepp/Tony Stone Images. 

How does chemistry explain the ethereal and breathtaking Aurora Borealis ... 

It has been known for centuries that many compounds emit visible radiation when they are exposed to sunlight. Luminescence phenomena, such as the aurora borealis, phosphorescence of the sea, luminous animals and insects, phosphorescent wood, etc., have fascinated man since antiquity, being reflected in the early scientific literature. Aristotle (384-322 b.c.) appears to be one of the first philosophers to recognize cold light in dead fish, fungi, and the luminous secretion of the cuttlefish [1],... 

A slightly more in-depth study of colour is afforded by The Physics and Chemistry of Colour by Kurt Nassau, Wiley, Chichester, 2001. The author describes many everyday examples of colour, from peacock tails through to the Northern Lights, Aurora Borealis. Its Chapter 1 is an overview, and is probably a little highbrow at times, but overall is a fascinating read. 

Plasma Types. Figure 1 (7—9) indicates the various types of plasmas according to their electron density and electron temperature. The colder or low electron energy regions contain cold plasmas such as interstellar and interplanetary space the earth s ionosphere, of which the aurora borealis would be a visible type alkali-vapor plasmas some flames and condensed-state plasmas, including semiconductors (qv). 

Celsius was a professor of astronomy al Uppsala University. He is noted for trying to determine the magnitude of the stars in (he constellation Aries. He published 316 of his observations on the aurora borealis. 

Periodic Properties Atomic Radii Interlude—The Aurora Borealis Atomic Spectra on a Grand Scale... 

The beautiful northern lights, or aurora borealis, are often observed in the Northern Hemisphere at high latitudes. The light is partly produced by excited O atoms in the upper atmosphere. 

Scientists have fixed 960 km as the approximate upper limit of the atmosphere. Aurora Borealis or the Northern light is the basis for this conclusion. 

To get a feel for the range of temperatures and densities of different plasmas, compare a star to the Aurora Borealis (or Northern... 

The Aurora Borealis, on the other hand, is a stream of cooling plasma leaving the surface of the Sun and colliding with other gases in the atmosphere of our planet. When it leaves the Sun, the temperature of the plasma stream is only about 6,200 Kelvin (11,000°F). It is comparatively cool and much less dense than a star. 

Aurora Borealis. The effect of a rainbow created in thin films by the deposition of inorganic compounds under high vacuum. 

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