By Richard A., Matzner, Richard A. Matzner
The Dictionary of Geophysics, Astrophysics, and Astronomy presents a lexicon of terminology protecting fields corresponding to astronomy, astrophysics, cosmology, relativity, geophysics, meteorology, Newtonian physics, and oceanography. Authors and editors frequently imagine - incorrectly - that readers are acquainted with all of the phrases in expert literature. With over 4,000 definitions and 50 contributing authors, this particular finished dictionary is helping scientists to take advantage of terminology appropriately and to appreciate papers, articles, and books during which physics-related phrases look.
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Extra resources for Dictionary of geophysics, astrophysics, and astronomy
Barium release An experimental procedure near-Earth space physics, in which barium is evaporated by a thermite charge, usually in a sunlit region above the (denser) atmosphere, creating a greenish cloud. Barium atoms are rapidly ionized (within 10 sec or so), and the ions form a purple cloud, which responds to © 2001 by CRC Press LLC magnetic and electric fields and therefore often drifts away from the neutral one. The technique was pioneered by Gerhard Haerendel in Germany, and many releases have been conducted from rockets above the atmosphere, often with the barium squirted out by a shaped explosive charge.
Aperture correction The difference between the photometric magnitude of an object as measured with two different-sized apertures. When making photometric measurements of stars on an image, the resulting magnitudes are often referenced to the light measured in a fixedsize aperture (perhaps a few arcseconds in diameter). However, this aperture is usually smaller than the full profile of the star (which can be as large as an arcminute or more for light that is still detectable above the background).
Auroral electrojet A powerful electric current, flowing in the auroral oval in the ionospheric E-layer, along two branches that meet near midnight. The branches are known as the eastward and westward auroral electrojets, respectively, and the region in which they meet, around 2200 magnetic local time, is the Harang discontinuity. The electrojets are believed to be Hall currents in the ionospheric E-layer and to be a secondary effect of the currents linking Birkeland currents of region 1 with those of region 2.