ultraviolet radiation
radiation with higher energy than visible light, but without as much energy as x rays
umbra ...
Ultraviolet radiation: the type of radiation that is shorter than the violet light that humans can see. This type of radiation can cause sunburn.
Ultraviolet Radiation
Electromagnetic radiation "beyond the violet" with wavelengths in the approximate range 100-4000 Å.
Ultraviolet Stars ...
Ultraviolet Radiation
Electromagnetic Radiation with wavelengths shorter than visible light but longer than X-rays
Umbra ...
ultraviolet radiation
artificial satellite
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Ultraviolet radiation has other medical applications, in the treatment of skin conditions such as psoriasis and vitiligo. UVA radiation can be used in conjunction with psoralens (PUVA treatment).
Ultraviolet radiation from a quasar will ionize gas in the surrounding intergalactic medium (IGM).
The ultraviolet radiation emitted by hot stars can remove electrons from dust grains.
Solar ultraviolet radiation destroys methane high in Neptune's atmosphere by converting it to hydrocarbons such as ethane, acetylene and haze particles of more complex polymers.
Fierce ultraviolet radiation streams from these young stellar giants, carving out exotic sculptures in the gas and lighting up the cloud in an eerie glow that has the effect of back-lighting dark, ominous-looking dust clouds.
X-rays and ultraviolet radiation are hazardous. Visible and infrared are life-saving. So how can they all be the same type of radiation?
We see visible light. Therefore, it must be different from the other radiation we can't see.
Short-wavelength ultraviolet radiation is effectively blocked by Earth's atmosphere. To study this region of the electromagnetic spectrum, instruments must be placed above our planet's atmospheric blanket.
Thermal radiation ranges in wavelength from the longest infrared radiation to the shortest ultraviolet radiation. thermal shock The development of a steep temperature gradient and accompanying high stresses within a structure.
The exposed inner region of the star left behind is initially so hot that the intense ultraviolet radiation it emits ionises the expanding, ejected shell. This results in the cloud glowing, similar to an emission nebula.
Pertaining to or same as ultraviolet radiation. ultraviolet astronomy (NASA Thesaurus) Use of special optical instruments for the observation of astronomical phenomena in the ultraviolet spectrum.
Ionosphere The region of the Earth's upper atmosphere containing a small percentage of free electrons and ions produced by photoionization of the constituents of the atmosphere by solar ultraviolet radiation.
The Cb component, a hot white dwarf, appears to be as bright as the class F dwarf 14 Aur Ca because of its intense ultraviolet radiation. Optically, it would appear much fainter and be difficult to detect.
Besides providing light and heat, the Sun affects the Earth through its ultraviolet radiation, the steady stream of the solar wind, and the particle storms of great flares.
Deeper within it, as dust blocks out an increasing amount of stellar ultraviolet radiation, the cloud becomes darker and colder.
A particular example is the absorption of ultraviolet radiation followed by emission of visible radiation. This effect is used in fluorescent paints and in 'fabric brighteners' added to detergents.
A few molecular transitions can be pumped, either collisionally or by ambient ultraviolet radiation, to give astrophysical masers.
Skin tanning is achieved by an increase in the dark pigment inside skin cells called melanocytes and it is actually an automatic response mechanism of the body to excessive exposure to ultraviolet radiation from the sun or from artificial sunlamps.
Mapping the heliopause from earth might be possible by deciphering reflected solar ultraviolet radiation. The heliopause is the boundary where the outgoing solar wind meets the incoming plasma of the local interstellar medium.
This layer is primarily responsible for absorbing the ultraviolet radiation from the Sun.
As a result, the planets orbiting the young Sun were subjected to intense X-ray and ultraviolet radiation emitted by the hot gas in the Solar atmosphere.
study of celestial objects by means of the ultraviolet radiation they emit, in the wavelength range from about 90 to about 350 nanometers.
Areas of the Sun associated with ultraviolet radiation are sunspots. They are related to ionization of the F region of Earth's atmosphere. When the daily Sunspot count is plotted over a month time, the graph is very spiky.
Late in the 19th Century, scientists began discovering forms of light which were insible to the naked eye: X-Rays, gamma rays, radio waves, microwaves, ultraviolet radiation, and infrared radiation. This had a major impact on astronomy.
The Sun is a source of ultraviolet radiation which is harmful to human skin. The Earth's ozone layer blocks the majority of the Sun's uv-radiation, which is beneficial for us but hampers ground-based ultraviolet astronomy.
The parent molecules are mainly split up by energetic ultraviolet radiation from the Sun into simple compounds. These are not necessarily like stable chemicals that we know on the Earth but are simple combinations of atoms.
This important shield protects the Earth from the Sun's ultraviolet radiation. Venus does not have an ozone layer. As a result the ultraviolet radiation from the Sun finds its way directly into Venus' atmosphere.
The dust in the coma reflects sunlight, and gas in the coma absorbs ultraviolet radiation and begins to glow. The comet starts to look like a big "fuzzy ball".
As the material collapses under its own weight, massive stars may form in the center, and their ultraviolet radiation ionizes the surrounding gas, making it visible at optical wavelengths.
This nebula exhibits many of the features we are describing here: the red light comes from hydrogen Balmer emission, excited by the ultraviolet radiation from a hot star embedded in the nebula.
Until September 1996, the International Ultraviolet Explorer (IUE) was operating and observing ultraviolet radiation. Its demise, although unfortunate, was hardly premature: was launched in January, 1978 with planned operations of three years.
A quasar (more recently known as a QSO, ) is a distant star-sized energy source in space with an excess of ultraviolet radiation. Some of these QSO's gives off large amounts of radiation, including radio waves and X-rays (but some are radio-quiet).
When the red giant star has ejected all of its outer layers, the ultraviolet radiation from the exposed hot stellar core makes the surrounding cloud of matter created during the red giant phase glow: the object becomes a planetary nebula.
UVSP was designed to study the ultraviolet radiation emitted by the Sun in flares, active regions, and prominences. It was capable of acquiring simultaneous images in four different spectral positions as it scanned across the Sun.
Emission nebula A cloud of glowing gas excited by ultraviolet radiation from hot stars.
Ephemeris (plural ephemerides) A tabulated list of positions for an object calculated from its orbital elements.
AEROS satellite was to study the science of the upper atmosphere and ionospheric F region's solar ultraviolet radiation. Aeros was built by Ball Aerospace for a co-operative project between NASA and the Bundesministerium f?
An emission nebula is a type of nebula that emits its own light, due to the presence of ultraviolet radiation from very hot young stars inside. Cloaking devices are useless inside emission nebulae.
These are regions where hot, blue OB stars are pouring large amounts of ultraviolet radiation into the surrounding cloud from which they recently formed.
Space, however, does contain very minute quantities of gases such as hydrogen and small quantities of meteorites and meteoric dust. X rays, ultraviolet radiation, visible light, and infrared radiation from the sun all traverse space.
NGC281 nebula near h Cassiopeiae permeates the associated open star cluster. Its gas is excited by young stars' ultraviolet radiation. NGC281 can be found 1°40' E of a Cassiopeiae (see finder chart below).
The region of the spectrum between about 100 and 4000 angstroms; also used in the restricted sense of ultraviolet radiation that reaches the ground, namely, that between about 3000 and 4000 angstroms.
umbra - (n.) ...
Emission Nebula: A cloud of gas that is excited by the ultraviolet radiation from hot stars.
HII Region - A region of ionized hydrogen surrounding a hot star. Ultraviolet radiation from the star keeps the gas in the HII region ionized ...
Electromagnetic radiation with very short wavelengths and very high energies and frequencies. X-rays fall between gamma rays and ultraviolet radiation; also called X-radiation or Roentgen ray.
X-power ...
A very small percentage of them can also put out significant amounts of ultraviolet radiation, but all stars are faint in the X-ray band. If you find an X-ray source, then you know something strange is happening with the object.
(NGC 3132), also known as the Southern Ring Nebula, is a bright planetary nebula approximately 2,000 light-years from Earth. It contains two faint stars lying close together. The central one is a hot white dwarf that emits the ultraviolet radiation ...
Its colors are produced by the emission of red, violet and blue light by the hydrogen within the nebulas mass. These emissions are caused by the hydrogen being excited by ultraviolet radiation from the hot young stars within the nebula.
 See also: Ultraviolet, Light, Sun, Solar, Earth
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