1/4 keV diffuse background map from the ROSAT all-sky survey. The projection is an Aitoff-Hammer equal-area in galactic coordinates with the Galactic center in the middle.
keV
one thousand electron volts.
Kilometer
abbreviated km. 1 km = 1000 meters = 105 cm = 0.62 mile.
A keV (or kilo-electron volt) is equal to one thousand electron volts.
An MeV (mega-electron volt) is equal to one million electron volts.
A GeV (giga-electron volt) is equal to one billion (109) electron volts.
More about electron volts...
40 keV can drop to normal interplanetary levels within about 100 km (a decrease by a factor of 1000). This drop-off is a result of the solar wind.
kiloelectron volt (keV) A unit used to describe the energy of X-rays, equal to a thousand electron volts.
kilometer A unit of distance equal to 0.6214 mile.
kinetic energy The energy of an object due to its motion.
Gamma rays are often defined to begin at 10 keV, although radiation from around 10 keV to several hundred keV is also referred to as hard x-rays.
High energy radiation (energies in excess of 100 keV) observed during large, extremely energetic solar FLARES. GAUSS. The unit of magnetic induction in the cgs (centimeter-gram- second) system. GEOMAGNETIC ELEMENTS.
=The energetic particles detector (EPD) is designed to measure the numbers and energies of ions and electrons whose energies exceed about 20 keV (3.2 fJ).
spectrometer consisting of a hemispherical electrostatic energy analyzer with a quadrupole electrostatic lens at the aperture was pointed towards the sun, to measure solar wind ions at 30 energy levels logarithmically spaced between 50 eV and 25 keV.
Burst and Transient Source Experiment (BATSE) by NASA Marshall Space Flight Center searched the sky for short duration gamma ray bursts (20 to 600 keV) and conducted full sky surveys for long-lived sources.
The official energy range of BATSE was 20 keV to 1 GeV, but in reality the low energy boundary of the SDs could be dropped to less than 7 keV by changing the gain on the photomultiplier.
The gas has temperature 4-7 keV corresponding to the temperature associated with the cluster velocity dispersion and spectra consistent with thermal brehmsstrahlung.
Although the more energetic X-rays (E 30 keV) can penetrate the air at least for distances of a few meters (they would never have been detected and medical X-ray machines would not work if this was not the case) the Earth's atmosphere is thick enough ...
5 to 30 keV (3.5 to 0.4Å). The central part of the images had a spatial resolution of 8 arc-seconds. The normal time resolution was about 8 seconds but some flare observations were obtained with 1.5 second time intervals.
The electrons will generally have a temperature comparable to or greater than that of the ions, so they will collide with the ions and emit x-ray radiation of 10-30 keV energy (Bremsstrahlung).
Photons of energy greater than about 10 keV. [McL97]
(d) Rays first discovered in radioactive material, and later identified as very high energy photons. [CD99]
(e) Extremely short-wavelength electromagnetic energy. [F88] ...
5 m observes the same event in the 2 keV energy range (see More Precisely 4-2 for a definition of the electron volt, or eV). Both detectors record the location of the event on the sky, to within the accuracy of their respective measurements.
It observes the electromagnetic spectrum from 30 keV to 30 GeV. The CGRO led to the discovery of . CGRO was named to honor Dr. Arthur Holly Compton, who studied the scattering of high-energy photons by electrons.
AXION - Hypothetical weakly-interacting boson of mass << 200 keV. Its existence would resolve what is known as the strong-CP problem in quantum chromodynamics.
Auroral acceleration--The process by which auroral electrons acquire their energies, typically 1-10 keV.
With 123 keV, the optimum temperature for this reaction is nearly ten times higher than that for the pure hydrogen reactions, the energy confinement must be 500 times better than that required for the D-T reaction, ...
In particular, Chandrayaan-1's Sub-keV Atom Reflecting Analyzer (SARA) mapped for the first time the energetic hydrogen atoms emanating from the Moon, ...
Definition: gamma ray: The highest energy, shortest wavelength electromagnetic radiations. Usually, they are thought of as any photons having energies greater than about 100 keV. (It's "gamma-ray" when used as an adjective.) ...
A keV (or kiloelectron volt) is equal to 1000 electron volts. An MeV is equal to one million electron volts. A GeV is equal to one billion (109) electron volts. A TeV is equal to a million million (1012) electron volts.
A flare can be likened to a giant natural synchrotron accelerating vast numbers of electrons to energies above 10 thousand-electron volts (KeV) and protons to those above one million-electron volts (MeV).
The Voyagers' LECPs are sensitive from around 10 keV up into the lower ranges of the Cosmic Ray detector. Ulysses' LECP is similar, and is named GLG for its Principal Investigators Gloeckler and Geiss.
They are classified on a scale of importance ranging from -1 (least important) to +3. Bursts are generally attributed to a sudden acceleration of some 1035-36 electrons to energies greater than 100 keV in less than 1 second. [H76]
Bus ...
A particle accelerator is used to create fast ion beams (the particle energies are on the order of 100 keV); the ion beam is then passed through a neutral gas region, where the ions neutralize via charge-exchange reactions with the neutral gas.
 See also: Energy, Ray, X-ray, Universe, Rays
|
