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Topic: Extreme ultraviolet Imaging Telescope

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	Extreme ultraviolet Imaging Telescope - Wikipedia, the free encyclopedia
		The Extreme ultraviolet Imaging Telescope (EIT) is an instrument on the SOHO spacecraft used to obtain high-resolution images of the solar corona in the ultraviolet range.
		EIT is built as a single telescope with a quadrant structure to the entrance mirrors: each quadrant reflects a different color of EUV light, and the wavelength to be observed is selected by a shutter that blocks light from all but the desired quadrant of the main telescope.
		Solar imaging with multilayer EUV optics was pioneered in the 1990s by the MSSTA and NIXT sounding rockets, each of which flew on several five-minute missions into space.
	en.wikipedia.org /wiki/Extreme_ultraviolet_Imaging_Telescope (888 words)

	Ultraviolet - Wikipedia, the free encyclopedia
		Extreme UV is characterized by a transition in the physics of interaction with matter: wavelengths longer than about 30 nm interact mainly with the chemical valence electrons of matter, while wavelengths shorter than that interact mainly with inner shell electrons and nuclei.
		Ultraviolet radiation is used for very fine resolution photolithography, a procedure where a chemical known as a photoresist is exposed to UV radiation which has passed through a mask.
		Ultraviolet detectors generally use either a solid-state device, such as one based on silicon carbide or aluminum nitride, or a gas-filled tube as the sensing element.
	en.wikipedia.org /wiki/Ultraviolet (3516 words)

	ESA Science & Technology: Source of high speed wind blowing from the Sun (Site not responding. Last check: 2007-10-14)
		Extreme ultraviolet images of the Sun taken with the EAS/NASA Solar and Heliospheric Observatory (SOHO) Spacecraft revealing gas at 1.5 million degrees shaped by magnetic fields.
		The colours are false; green in the original Extreme Ultraviolet Imaging Telescope (EIT) instrument color scheme.
		The SUMER spectrometer analyzes ultraviolet light which is given off by the hot gases in the Sun's atmosphere, and is ideal for studying atmospheric motions and turbulence.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=12262 (340 words)

	Museum Eclipse 2001: Event - Images
		Full field image taken by the Extreme ultraviolet Imaging Telescope (EIT) at the NASA Goddard Space Flight Center July 15 1999, 13:00:14.
		Full field image taken by the Extreme ultraviolet Imaging Telescope (EIT) at the NASA Goddard Space Flight Center July 15 1999, 14:12:11.
		Full field image taken by the Extreme ultraviolet Imaging Telescope (EIT) at the NASA Goddard Space Flight Center July 15 1999, 13:06:03.
	www.museumeclipse.org /event/images_sun.html (241 words)

	Solar Images & Movies
		Ultraviolet image of the Sun Image in Fe XII 195Å obtained on 1996 August 22 at 20:15 UT.
		The Sun's outer atmosphere as it appears in ultraviolet light emitted by electrically charged oxygen flowing away from the Sun to form the solar wind (region outside fl circle), and the disk of the Sun in light emitted by electrically charged iron at temperatures near two million degrees Celsius (region inside circle).
		The structure of the corona is controlled by the Sun's magnetic field which forms the bright active regions and the ray-like structures originating in the coronal holes.
	www.trincoll.edu /~bwalden/ast103/sun2.html (1468 words)

	ESA Portal - Information Notes - SOHO reveals violent action on the quiet Sun (Site not responding. Last check: 2007-10-14)
		Apart from the imager, two ultraviolet spectrometers and an ultraviolet coronagraph (an imager for the outer atmosphere) are busy analysing the violent processes at a wide range of wavelengths.
		The scientists conclude that the solar wind blowing from high-latitude regions of Sun is less strong, at least during the present quiet phase of the eleven-year cycle of activity.
		The Earth is also visible in the maps, because a cloud of hydrogen gas called the geocorona envelops it and glows in the ultraviolet.
	www.esrin.esa.it /export/esaCP/Pr_7_1996_i_EN.html (1441 words)

	Ultraviolet...Astroppo.com
		Ultraviolet (UV) radiation is electromagnetic radiation of a wavelength shorter than that of the visible region, but longer than that of soft X-rays.
		Many birds have patterns in their plumage that are invisible at usual wavelengths but seen in ultraviolet, and the urine of some animals is much easier to spot with ultraviolet.
		In 1801 he used silver chloride, a light-sensitive chemical, to show that there was a type of invisible light beyond violet, which he called chemical rays.
	www.astroppo.com /ultraviolet.html (1059 words)

	ESA Science & Technology: Solar Atmosphere (Site not responding. Last check: 2007-10-14)
		EIT (Extreme Ultraviolet Imaging Telescope) observes the whole Sun at four different ultraviolet wavelengths.
		CDS has proved to be especially valuable for deducing temperatures and densities of the gas, while SUMER excels in measuring velocities of gas streams, and detecting previously unknown ultraviolet emissions.
		UVCS (Ultraviolet Coronagraph Spectrometer) masks the solar disc to observe and analyse ultraviolet emissions from the corona, from 350 000 to 14 million kilometres above the visible surface.
	sci.esa.int /science-e/www/object/index.cfm?fobjectid=2546 (1010 words)

	Navy & Satellites - SOHO: Instruments
		The Extreme Ultraviolet Imaging Telescope (EIT): The EIT images the solar atmosphere at four different wavelengths of extreme ultraviolet light, which is between ultraviolet and x-ray light on the electromagnetic spectrum.
		The temperatures in the Sun are extreme enough to ionize atoms of gas.
		EIT was built by an international consortium that included the Naval Research Laboratory, which developed the telescope's CCD (charge-coupled device) camera and electronic support package.
	www.onr.navy.mil /focus/spacesciences/satellites/soho3.htm (406 words)

	SOHO Hot Shot: Then and Now: Ten Years After EIT's First Light (Site not responding. Last check: 2007-10-14)
		Only two quadrants of the CCD detector were imaged in eight- and nine-times ionized iron (Fe IX and X) at 171 Å (upper left), at 19:12 and 19:24 UT; a full field of view image (2006 January 2, 19:00 UT) shows the Sun ten years later (upper right).
		The Extreme ultraviolet Imaging Telescope (EIT) was kept at a higher temperature than the rest of the spacecraft for a month after launch, however, in an attempt to outgas any water vapor and other contaminants that might have adhered to the telescope interior or detector, so EIT's "first light" was obtained on 2006 January 2.
		Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) spacecraft.
	zeus.nascom.nasa.gov /~shaugan/hotshot (534 words)

	ESA - Space Science - Home - What is a SOHO/EIT CCD ‘bakeout’?
		'Bakeout' is a procedure where the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO is taken offline in order to maintain the performance of the instrument.
		Thanks also to a manufacturing process called backside-thinning, it is senstitive to extreme ultraviolet (EUV) light.
		The back end of the EIT telescope near the CCD is, unfortunately, the coldest and most difficult place for these vapours to escape from.
	www.esa.int /esaSC/SEMN6TVLWFE_index_2.html (397 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Identical EUVI telescopes on the two STEREO spacecraft will study the structure and evolution of the solar corona in three dimensions, and specifically focus on the initiation and early evolution of coronal mass ejections (CMEs).
		The EUVI telescope is being developed at the Lockheed Martin Solar and Astrophysics Lab.
		The telescopes are grouped by instrumental approach: the Magritte Filtergraphs (R. Magritte, famous 20th Century Belgian Surrealistic Artist), five multilayer EUV channels with bandpasses ranging from 195 to 1216 \x8F, and the SPECTRE Spectroheliograph with one soft-EUV channel at OV 629 \x8F.
	www.astro.uu.nl /~rutten/rrtex/bibfiles/ads/abs/artzner.txt (5915 words)

	The Solar System (Site not responding. Last check: 2007-10-14)
		The Sun is 4.5 billion year old and is expected the run out of hydrogen in its core in another 5 billion years, at which point radical changes will occur both to the sun and the entire solar system as the sun "dies".
		Courtsey of SOHO/Extreme Ultraviolet Imaging Telescope (EIT) consortium, NASA
		Courtesy of SOHO/Extreme Ultraviolet Imaging Telescope (EIT) consortium, NASA
	earthguide.ucsd.edu /planets/sun.html (174 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		Images from the Michelson Doppler Imager and the Extreme Ultraviolet Imaging Telescope on SOHO are posted on the Internet at: http://sohowww.nascom.nasa.gov "Scientists on both sides of the Atlantic have waited anxiously for the recovery of SOHO," commented Roger Bonnet, ESA's director of science.
		On July 23, SOHO was located using radar techniques with the 305-meter Arecibo, Puerto Rico, radio telescope of the U.S. National Astronomy and Ionosphere Center as a transmitter and a 70-meter dish of the NASA Deep Space Network as a receiver.
		SOHO first responded to radio transmissions on August 3, and telemetry from SOHO was received August 8, telling controllers the condition of the spacecraft and its instruments.
	quest.arc.nasa.gov /space/news/1998/10-14-98a.txt (697 words)

	HESSI News and Events (Site not responding. Last check: 2007-10-14)
		Latest Ultraviolet (171 Å) image of Sun taken by the SOHO Extreme Ultraviolet Imaging Telescope.
		Latest Ultraviolet (284 Å) image of Sun taken by the SOHO Extreme Ultraviolet Imaging Telescope.
		Latest Ultraviolet (304 Å) image of Sun taken by the SOHO Extreme Ultraviolet Imaging Telescope.
	cse.ssl.berkeley.edu /hessi_epo/html/gallery_daily_sun.html (169 words)

	SOHO "sunquake" telescope appears OK
		valuable telescope for studying seismic waves and other vibrations on the sun is alive again, although a few more weeks are needed before scientists know for sure if they can resume normal observations with it.
		The MDI is the Michelson Doppler Imager, one of several telescopes on the Solar Heliospheric (SOHO) spacecraft.
		The SOHO recovery web site also reports the Extreme ultraviolet Imaging Telescope (EIT) is functioning well, and all four of its cameras are reporting good status.
	science.nasa.gov /newhome/headlines/ast14oct98_1.htm (540 words)

	SOHO snaps spectacular Sun shot
		Relatively cool, because the plasma observed by the Extreme-ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) was only 60 000 - 80 000 degrees Celsius, unlike the 1.5 - 2 million degrees Celsius plasma surrounding it in the Sun's tenuous outer atmosphere, or 'corona'.
		At the time of this snapshot, taken in the light of singly-ionised helium, the eruptive prominence was over 700 000 km across - over fifty times Earth's diameter - and was moving in excess of 75 000 km per hour.
		We say 'relatively' cool, because the plasma observed by the Extreme-ultraviolet Imaging Telescope (EIT) on board SOHO was only about 80 000 degrees Celsius, compared to the plasma at one or two million degrees Celsius surrounding it in the Sun's tenuous outer atmosphere, or 'corona'.
	www.physlink.com /News/Index.cfm?ID=149 (336 words)

	The Sun: Extreme Ultraviolet Light (Site not responding. Last check: 2007-10-14)
		Two images are shown here: one that is made from light with a wavelength of 19.5 nanometers, and one from light with a wavelength of 30.4 nanometers (nm).
		These are in the realm of the Extreme UltraViolet (EUV).
		These images come from the Extreme ultraviolet Imaging Telescope (EIT), an instrument on the SOlar and Heliospheric Observatory (SOHO).
	solar.physics.montana.edu /YPOP/Spotlight/Today/ultraviolet.html (235 words)

	Cool microflares could be solar hot spots
		In their quest to find out why the sun's corona is so much hotter than the visible surface, scientists have looked at the biggest and brightest events on the surface.
		The green image is from the SOHO EIT in Fe XII, and the fl and white image is from the Kitt Peak National Observatory magnetograph.
		And solar physicists are looking forward to 2004 when Japan will launch Solar B with a more powerful array of telescopes that should have even finer resolution to test their theories.
	science.nasa.gov /newhome/headlines/ast31may99_1.htm (1432 words)

	SOLAR PHYSICS 1998 PUBLICATIONS
		By comparing the LASCO observations with Fe XII 19.5 nm spectroheliograms made with the Extreme-ultraviolet Imaging Telescope (EIT) on SOHO between 1997 April and 1998 February, we have identified 27 correlated white-light and extreme-ultraviolet (EUV) jet events.
		The onset of the event in LASCO is coincident (to within measurement uncertainties) with an eruptive event detected in extreme ultraviolet observations of the solar disk by the SOHO EIT.
		Abstract: The Extreme UV Imaging Telescope (EIT) instrument is operating on-board the SOHO spacecraft since January 1996.
	wwwsolar.nrl.navy.mil /sp_pubs_98.html (4323 words)

	UVCS/SOHO Eclipse Page
		The part inside the ring is from SOHO's Extreme Ultraviolet Imaging Telescope (EIT) and is made from light emitted by electrically charged iron with 14 of its 26 electrons removed by collisions with other hot particles.
		The part of the image outside the fl ring is from the Ultraviolet Coronagraph Spectrometer (UVCS) and is made from light emitted by electrically charged oxygen with 5 of its 8 electrons removed by collisions with other hot particles.
		UVCS observes the faint ultraviolet light from the extended solar corona.
	cfa-www.harvard.edu /uvcs/observations/eclipse98.html (623 words)

	GPN-2002-000120 - Series of Images from SOHO
		The Solar and Heliospheric Observatory (SOHO), a joint project of the European Space Agency and NASA, took this sequence of images with the Extreme Ultraviolet Imaging Telescope, one of the observatory's 12 instruments.
		Easily visible on the lower left side is an "eruptive prominence" or blob of 60,000 F (33,315 C) gas measuring more than 80,000 miles (128,747 km) long.
		Please note that the image number assigned to this image is not an official NASA number.
	grin.hq.nasa.gov /ABSTRACTS/GPN-2002-000120.html (180 words)

	TRACE (Site not responding. Last check: 2007-10-14)
		TRACE, carried a 30-cm extreme ultraviolet imaging telescope for studies of the sun.
		Lockheed was the lead contractor while the Smithsonian Astrophysical Observatory made the telescope mirrors.
		The telescope mirrors were made by the Smithsonian Astrophysical Observatory.
	www.friends-partners.org /oldfriends/mwade/craft/trace.htm (165 words)

	HupSoft - Background Info - Sun Images
		Every eclipse begins at sunrise at some point in its track and ends at sunset about half way around the world from the start point.
		The Sun is 4.5 billion years old and has used up half of the hydrogen in its core.
		The three photographs of the total solar eclipse of 1995 Oct 24 were taken by Fred Espenak of NASA Goddard Space Flight Center from the small town of Dundlod, India.
	home.wanadoo.nl /hup/se/bginfo/sunpics.htm (267 words)

	The LASCO Data Archive
		The data archive for the Large Angle Spectrometric Coronagraph (LASCO) and the Extreme Ultraviolet Imaging Telescope (EIT) is designed to contain 1 B of image data in an easy to use CD-R based archive.
		The Large Angle Spectrometric Coronagraph Observatory (LASCO) and the Extreme Ultraviolet Imaging Telescope (EIT) are instruments aboard the Solar Heliospheric Observatory (SOHO).
		The three coronagraphs of LASCO and the EIT telescope produce the equivalent of 100 1024×1024 16-bit images of the Sun and the solar corona out to 30 solar radii each day.
	www.cv.nrao.edu /adass/adassVI/wangd.html (1469 words)

	Space Today Online -- The Sun and the Solar System -- See the Sun in Extreme Ultraviolet Light
		These three colorful NASA images of the Sun were recorded on the same day by the Extreme ultraviolet Imaging Telescope (EIT) aboard the spacecraft SOHO, which is in orbit around our star.
		Corona is the outermost layer of the solar atmosphere consisting of a highly rarefied gas with a temperature greater than one million degrees Kelvin.
		It is visible to the naked eye during a solar eclipse.
	www.spacetoday.org /SolSys/Sun/SunInEUV.html (534 words)

	Solar Physics Branch Home Page, Naval Research Laboratory
		The EUV Imaging Spectrometer (EIS) is being prepared by a consortium of institutions led by Prof J.L. Culhane at the MSSL/UCL in the UK.
		The Large Angle Coronagraph-Spectrograph (LASCO) and Extreme ultraviolet Imaging Telescope (EIT) experiments are two instrument packages aboard the Solar and Heliospheric Observatory (SOHO).
		The Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) experiment aboard the Upper Atmosphere Research Satellite (UARS) measured the the solar UV spectral irradiance in the 115-410 nm wavelength range from October 11, 1991 to August 1, 2005.
	wwwsolar.nrl.navy.mil (753 words)

	ESA Portal - Protecting the Environment - The Sun now (Site not responding. Last check: 2007-10-14)
		SEE the bright twisted clouds of hot gas, revealing storminess, and the dark, calm regions called coronal holes.
		These images, obtained with invisible ultraviolet light, give the scientists their routine weather maps of the Sun.
		Different colours denote various ultraviolet wavelengths, each emanating from gas at a particular temperature - orange, 80 000 degrees, blue 1 000 000 degrees, green 1 500 000 degrees and yellow 2 500 000 degrees.
	www.esrin.esa.it /export/esaCP/ASEER1AKOYC_Protecting_2.html (99 words)

	[No title]
		SOHO Extreme ultraviolet Imaging Telescope (EIT) full-field Fe XII 195 Ã images from NASA Goddard Space Flight Center
		SOHO Extreme ultraviolet Imaging Telescope (EIT) full-field Fe XV 284 Ã images from NASA Goddard Space Flight Center
		SOHO Extreme ultraviolet Imaging Telescope (EIT) full-field He II 304 Ã images from NASA Goddard Space Flight Center
	polaris.umuc.edu /~sdsilva/Sun/current_sun0.html (588 words)

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