Radar uses electromagnetic radiation at microwave frequencies; the atmospheric absorption at typical radar wavelengths is very low, meaning observations are not prevented by cloud cover.
12.
By using a telescope which flew at over 42, 000 meters high, it was possible to reduce the atmospheric absorption of microwaves to a minimum.
13.
Though hindered by atmospheric absorption of the escaping gamma rays, these theories do not require the exceptionally intense lightning that high altitude theories of TGF generation rely on.
14.
One situation where the equation is reasonably accurate is in satellite communications when there is negligible atmospheric absorption; another situation is in anechoic chambers specifically designed to minimize reflections.
15.
However, the variations in the solar constant that Abbot derived from the results of his other solar observatories never convinced most meteorologists either, and were ascribed to uncorrected variations in atmospheric absorption.
16.
Long distance radars use the lower microwave frequencies since at the upper end of the band atmospheric absorption limits the range, but millimeter waves are used for short range radar such as collision avoidance systems.
17.
First, infrasound propagates over vast distances through the Earth's atmosphere as a result of very low atmospheric absorption and of refractive ducting that enables propagation by way of multiple bounces between the Earth's surface and the stratosphere.
18.
For example, the 1978 NASA SPS study required a 1-km diameter transmitting antenna, and a 10 km diameter receiving rectenna, for a microwave beam at atmospheric absorption and even potential beam blockage by rain or water droplets.
19.
:: : To rephrase that : if you hold up a quarter to the Sun, it will get nearly the same amount of light anywhere-North Pole, equator, noon, sunset-subject only to the atmospheric absorption mentioned and some minor differences in distance.
20.
To avoid atmospheric absorption of infrared radiation, Low developed devices that could be placed aboard aircraft, first using a Douglas A-3 Skywarrior from the United States Navy that carried a 2-inch telescope in 1965 and 1966, and later using a Learjet operated by NASA with a 12-inch telescope on board.
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