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Topic: Spectroheliograph

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	Spectroheliograph - LoveToKnow 1911
		The calcium flocculi, on account of the brilliant reversals of the H and K lines to which they give rise, and the protection to the plate afforded by the diffuse dark bands in which these bright lines occur, are easily photographed with a spectroheliograph of low dispersion.
		A spectroheliograph which gives excellent results with the lines of calcium, hydrogen and iron is shown in the figure.
		The spectroheliograph, originally designed for photographing the solar prominences, disclosed in its first application at the Kenwood Observatory (Chicago, 1892) a new and unexplored region of the sun's atmosphere.
	www.1911encyclopedia.org /Spectroheliograph (1090 words)

	SPECTROHELIOGRAPH,
		The spectroheliograph, in conjunction with a telescope, photographs the sun in monochromatic light using the spectrum.
		In its simplest form, a spectroheliograph consists of a spectograph with two slits in front of a photographic plate; the slit nearer to the sun is smaller.
		The spectroheliograph was invented in 1889 by the American astronomer George Hale.
	www.history.com /encyclopedia.do?vendorId=FWNE.fw..sp160800.a (273 words)

	spectroheliograph - Encyclopedia.com
		spectroheliograph device for photographing the surface of the sun in a single wavelength of light, usually one corresponding to a chief element contained in the sun, e.g., hydrogen or calcium; the resulting photograph is called a spectroheliogram.
		The spectroheliograph was invented in 1890 independently by G. Hale and by H. Deslandres and modernized (1932) by R. McMath to take motion pictures.
		Arthur B.C. Walker II of Stanford University, the principal investigator for the Chromospheric/Corona Spectroheliograph telescope.
	www.encyclopedia.com /doc/1E1-spectroh.html (275 words)

	Spectroheliograph Information
		The spectroheliograph is an instrument used in astronomy.
		It captures a photographic image of the Sun at a single wavelength of light, a monochromatic image.
		The light is focused onto a photographic medium and the slit is moved across the disk of the Sun to form a complete image.
	www.bookrags.com /Spectroheliograph (116 words)

	Spectroheliograph - Search Results - ninemsn Encarta
		Spectroheliograph, important part of the equipment used in astronomy to photograph features of the Sun, such as the photosphere (the inner layer of...
		I t is in this particular case about the spectroheliograph, an instrument intended to produce monochromatic images of the Sun in various wavelengths and almost reserved until...
		Spectroheliograph definition, words related to spectroheliograph, proper usage and pronunciation of the word spectroheliograph from YourDictionary.com.
	au.encarta.msn.com /Spectroheliograph.html (181 words)

	Spectrohelioscope
		spectroheliograph at present used with the Yerkes telescope is the instrument designed by the writer in l889, and used in his work at the Harvard and Kenwood Observatories.
		In spite of the great weight of such an instrument this large aperture would not of itself be an insuperable objection, were it not for the fact that the ruled surface of the grating (or the edge of base of the prisms, in case they were chosen) would be between l2 and l8 inches long.
		Hence the form of spectroheliograph described in the last paragraph on page 256 of the article already referred to has been adopted, substituting, however, one, two, or three simple prisms, with or without a plane mirror, for the grating and plane mirror there described.
	www.cartage.org.lb /en/themes/Sciences/Astronomy/Equipementdevices/spectrohelioscope/spectrohelioscope.htm (973 words)

	* Spectroheliograph - (Astronomy): Definition
		Hale's "spectroheliograph, " invented in 1892 and viewing the Sun in narrow color bands, allowed a completely new range of phenomena to be observed.
		American revolutionized spectral observations by inventing and using the spectroheliograph; discovered magnetic fields in sunspots; first astronomer to be officially called an astrophysicist; founded the Yerkes, Mt. Wilson, and Palomar Observatories...
		Hale invented the spectroheliograph (a device used to analyse the Sun's spectrum) when he was an undergraduate at the Massachusetts Institute of Technology (Cambridge, Massachusetts, USA).
	en.mimi.hu /astronomy/spectroheliograph.html (222 words)

	San Fernando Observatory (SFO)
		A coudé configuration is used to feed a vacuum spectroheliograph, which is too massive to mount directly onto the telescope.
		The 11-in reflector is mounted directly on the main tube of the 24-in telescope, made possible by the tube's especially heavy construction.
		The spectroheliograph is fed a solar image from either the 24-in or 11-in telescope with a resultant diameter of about 4 1/2 inches.
	www.csun.edu /sfo/instrumentation.html (825 words)

	Spectroheliograph: Free Encyclopedia Articles at Questia.com Online Library (Site not responding. Last check: )
		SPECTROHELIOGRAPH device for photographing the surface of the sun in a single wavelength of light, usually one corresponding...element contained in the sun, e.g., hydrogen or calcium; the resulting photograph is called a spectroheliogram.
		The spectroheliograph was invented in 1890 independently by G. Hale and by H. Deslandres and modernized (1932) by R. McMath to take...
		In 1890 he invented the spectroheliograph, which led to the discovery of magnetic fields and vortices in sunspots.
	www.questia.com /library/encyclopedia/101272041 (394 words)

	Resources (Site not responding. Last check: )
		It is attached to the focal plane of the spectrograph of the 60 cm Domeless Solar Telescope at Hida Observatory, Kyoto University.
		Therefore, a spectroheliograph is suitable to obtain a data cube (spatial 2-D + spectral 1-D) for quantitative spectral analyses such as velocity field calculations.
		In our spectroheliograph system, up to three CCD video cameras can be attached to the spectrograph, and we can simultaneously observe up to three wavelength bands, for example, Ca II K/G-band/Halpha,with three CCD video cameras, owing to the wide wavelength coverage of the spectrograph.
	www.spieworks.com /resources/techLibrary/index.cfm?action=abstract&bibcode=2003SPIE.4853..584H (285 words)

	Telescope: Snow Solar Telescope
		To do that, he would have to attach the device he’d designed to photograph the Sun, a spectroheliograph, to the Yerkes refractor.
		The solar telescope would use a moveable mirror, called a coelostat (pronounced “seelostat”), to constantly reflect the Sun’s image into its instruments, even as the Sun moved across the sky.
		Because the mirror, not the telescope, would move to follow the Sun, the spectroheliograph could be fastened to stone or concrete supports.
	amazing-space.stsci.edu /resources/explorations/groundup/lesson/scopes/snow/index.php (234 words)

	spectroheliograph - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "spectroheliograph" is defined.
		spectroheliograph : The American Heritage® Dictionary of the English Language [home, info]
		SPECTROHELIOGRAPH : 1911 edition of the Encyclopedia Britannica [home, info]
	www.onelook.com /?w=spectroheliograph (138 words)

	Astronomy (Site not responding. Last check: )
		The American astronomer George Ellery Hale used spectroscopic technology to build the spectroheliograph, a device that tracks the sun and photographically records an image of its perimeter, prominences, and corona.
		A photographic plate may be passed across this slit in order to record the wavelength of light selected for the star being studied.
		Not long after the development of the spectroheliograph, ruled gratings were developed.
	www1.umn.edu /scitech/assign/as/spectrohelio.html (172 words)

	Deslandres, Henri Alexandre
		His work in spectroscopy led to his construction of the spectroheliograph for his solar studies.
		In 1902 he predicted that the Sun would be found to be a source of radio waves, and 40 years later this was confirmed.
		Deslandres's spectroheliograph was finished a year later than Hale's spectrograph but was particularly well adapted to studying the solar chromosphere.
	www.cartage.org.lb /en/themes/Biographies/MainBiographies/D/Deslandres/1.html (137 words)

	SPECTROHELIOGRAPH - Online Information article about SPECTROHELIOGRAPH
		An electric motor, belted to a screw (1 or 1') connected with the spectroheliograph, is then started.' The screw moves the spectroheliograph at a perfectly See also:
		It is evident that by the use of a spectroheliograph of sufficiently high dispersion, photographs may be taken of vapours in the sun represented by lines narrower than those of calcium and hydrogen.
		Meudon, and the erection of a spectroheliograph of 75 ft. focal length on Mount Wilson was at the end of 1908 contemplated for an See also:
	encyclopedia.jrank.org /SOU_STE/SPECTROHELIOGRAPH.html (1726 words)

	NSO/SP: ESF User's Manual: Spectroheliograph
		The spectroheliograph produces full disk images of the sun at specified wavelengths.
		Up to three wavelengths may be imaged simultaneously.
		Basically, the spectroheliograph has two spectrographs mounted back-to-back.
	nsosp.nso.edu /esf/userman/spectroheliograph.html (211 words)

	Spectroheliograph Summary (Site not responding. Last check: )
		A spectroheliograph is an instrument for producing monochromatic (single-wavelength) photographs of the Sun.
		In the first such device, designed by George Ellery Hale in 1891, square prisms were rotated in front of one slit and behind a second.
		The distribution of an element on the solar surface can be determined with a spectroheliograph by selecting the appropriate wavelengths.
	www.shvoong.com /science/418325-spectroheliograph (175 words)

	National Park Service: Astronomy and Astrophysics (Mount Wilson Observatory)
		The mirrors of the telescope are attached to motorized mountings in an assembly housed in a small white dome 60 feet above the ground.
		The siting of the spectroheliograph in a pit dug 30 feet into the bedrock of the mountain, below the telescope, provides a stable vibration-free location calculated to produce sharp images of the sun.
		The instrument pit containing the spectroheliograph is located 75 feet into the bedrock of the mountain.
	www.cr.nps.gov /history/online_books/butowsky5/astro4d.htm (3535 words)

	Image Monochromator (US Patent 4,705,396) (Site not responding. Last check: )
		By means of, say, a telescopic lens, an image of an object to be studied is projected onto the plane of the moving input slit and an image is produced in turn on a photographic plate immediately beyond the moving output slit.
		Interference filters are of special interest in applications where the mechanical complexity of the spectroheliograph cannot be justified.
		Due to the use of a dispersive means such as a diffraction grating or prism it is possible to select a required narrow wavelength band with great precision, as is the case with the classical spectroheliograph.
	hem.passagen.se /scientor/USPat87.html (2252 words)

	Project NOVA (Site not responding. Last check: )
		One of these instruments was the spectroheliograph which is an extension of the older spectroscope.
		This is due to the intense glare from the photosphere which does not allow observation of fainter details or the higher gases of the chromosphere.
		Before the invention of the spectroheliograph, it was possible to study the solar atmosphere only at the time of a total eclipse of the Sun.
	www.uncfsu.edu /msec/nova/timmod6f.htm (291 words)

	NSSDC Master Catalog Display: Experiment (Site not responding. Last check: )
		The first was a grazing-incidence spectrometer with a spectral resolution of 1.0 A, used to cover the range 120 to 400 A. The various discrete wavelengths were detected by three Bendix electron multipliers mounted on a moving carriage.
		Second, a long X-ray spectroheliograph with a bandpass of 2 A was used to cover the range 8 to 15 A. The third instrument was a short X-ray spectroheliograph, used to cover the range 1.7 to 8.0 A. Both X-ray spectroheliographs used the balanced filter method.
		The spatial resolution of the EUV spectroheliograph was 10 x 20 arc seconds.
	nssdc.gsfc.nasa.gov /database/MasterCatalog?sc=1971-083A&ex=1 (248 words)

	Artificial Eclipses -- Monday, Nov. 18, 1946 -- Page 1 -- TIME
		This difference allows astronomers to photograph the brighter parts of the sun's atmosphere with a "spectroheliograph," a prism spectroscope which casts sunlight of only one color on a photographic plate.
		Accomplishing the same object as the spectroheliograph, it is much more effective and easier for astronomers to use.
		When built into a coronagraph, it lets the complexities of the sun's atmosphere be seen in all their terrifying glory.
	www.time.com /time/magazine/article/0,9171,777332,00.html (736 words)

	Visualizing the Future Human Evolution (Site not responding. Last check: )
		In the 1890s, when the American astronomer George Ellery Hale combined the technology of spectroscopy and photography and came up with a new and better way to study the Sun.
		The spectroheliograph allowed astronomers to choose a certain type of light to analyze.
		Today, more technologically advanced versions of the spectroheliograph and coronagraph are used to study the Sun.
	www.human-evolution.org /visual_telescopes.php (3371 words)

	SPIE Proceedings Vol. 3406
		The paper presents a detailed description of the overall structure, electronic design and the main characteristics of the instruments, preliminary results of flight functioning of the TEREK-C and RES-C instruments and examples of the images and spectra of the Sun obtained in the experiment.
		Abstract: The paper describes the main characteristics of the X-ray optical elements (multilayer spherical and aspherical mirrors and diffraction gratings for the 13-30 nm XUV spectral region, Bragg crystal spherical mirrors for the 0.18 and 0.84 m soft X-ray spectral regions) manufactured for the TEREK-C solar XUV telescope array and the RES-C solar spectroheliograph.
		We describe the design and properties of Al-Formvar composite filters on rigid mesh supports with a spacing of 0.7 mm and 2 mm, which have been mounted in front of the XUV spectral channels of both instruments.
	www.spie.org /web/abstracts/3400/3406.html (1830 words)

	The Telescope Builder - Steve Silkin - Eclectica Magazine v8n1
		He was a serious guy when in 1890, at 22 and completing his studies at the Massachusetts Institute of Technology, he invented the spectroheliograph, a device that photographs the sun in a narrow range of light wavelengths.
		The spectroheliograph showed solar astronomers that sunspots had magnetic fields.
		After the spectroheliograph, Hale built an observatory at an isolated outpost in Wisconsin, recruiting the leading astronomers of his day.
	www.eclectica.org /v8n3/silkin.html (1229 words)

	Observation du Soleil avec un spectroheliographe - Ph. Rousselle
		Observation du Soleil avec un spectroheliographe - Ph.
		t is in this particular case about the spectroheliograph, an instrument intended to produce monochromatic images of the Sun in various wavelengths and almost reserved until now for professional observatories.
		Thus, it is an incentive intended for the amateurs to exploit new possibilities when technology allows it.
	www.astrosurf.com /spectrohelio/index-gb.htm (187 words)

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