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chromosphere
chromosphere
chromosphere A region of a star's atmosphere above its photosphere. The Sun's chromosphere extends from the
temperature minimum, some 500 km above the base of the photosphere, outwards by 9000 km where it merges with the
corona. For the first 1500 km the chromosphere is more or less continuous, but above this it breaks up into jagged
spicules. The temperature of the chromosphere rises from 4400 K at 500 km to about 6000 K at 1000–2000 km. There is a rapid rise to coronal temperatures at heights of about 2500 km (the
transition region), the exact height depending on the strength of the local magnetic field. At the top of the chromosphere, the density is a millionth of its value at the bottom. Immediately before and after a total solar eclipse, the chromosphere is visible either as a crescent or a diamond ring, with red coloration due to
Hα emission from which it takes its name (meaning ‘colour sphere’). Outside eclipses it is visible in Hα and calcium K-line
filtergrams, and from space in ultraviolet emission lines. The presence of chromospheres in nearby cool dwarf stars is deduced from similar emissions.
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Magnetic Field Uses Sound Waves to Ignite Sun's Ring of Fire
Newspaper article from: U.S. Newswire; 5/29/2007; 700+ words
; ...of hot gas that shape and power the chromosphere, a thin region of the sun's atmosphere...Meeting in Honolulu, Hawaii. The chromosphere is important because it is largely...middle of the last century -- why the chromosphere (and the tenuous corona above) is...
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Recent findings from University of Salford highlight research in astrophysics.
Newspaper article from: Physics Week; 9/9/2008; 700+ words
; ...coalescence of two current loops in the solar chromosphere, by altering the neutral- hydrogen...proceeds significantly faster in the upper chromosphere, where the density of ions (protons...hydrogen is comparable, than in the lower chromosphere, where the density of neutral- hydrogen...
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Recent findings from K.P. Reardon and co-authors highlight research in astrophysics.
Newspaper article from: Physics Week; 8/11/2009; 668 words
; ...employed as diagnostics of the solar chromosphere. The vastly disparate appearance between...the high-frequency behavior of the chromosphere. Using the same analysis, we find...which show significant portions of the chromosphere dominated by magnetic structuring...
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Big chill in the solar atmosphere. (includes article on crystal holography)
Magazine article from: Science News; 1/8/1994; ; 700+ words
; ...astronomers. New data now suggest that the chromosphere--that portion of the sun's atmosphere...SCIENCE. Astronomers had viewed the chromosphere as a relatively uniform blanket of...temperatures. At 2,000 km, near the chromosphere's upper boundary, the temperature...
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MAGNETIC FIELD USES SOUND WAVES TO IGNITE SUN'S RING OF FIRE
News Wire article from: US Fed News Service, Including US State News; 5/29/2007; 700+ words
; ...in Hawaii. This region, called the chromosphere because of its color, is largely responsible...the last century - why the sun's chromosphere (and the corona above) is much hotter...fountains upward and into the solar chromosphere. The magnetic fountains form the mold...
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Scientists demystify Sun's outer ring's secrets
News Wire article from: The Hindustan Times; 5/30/2007; 635 words
; ...revealed. This region, called the chromosphere because of its colour, is largely...fountains upward and into the solar chromosphere. The leaking waves propel fountains...fountains forming the mould for the chromosphere. McIntosh said the new result could...
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Reports outline astrophysics study findings from G.G. Sacco and colleagues.
Newspaper article from: Physics Week; 1/6/2009; 700+ words
; ...Tauri stars and the role of the stellar chromosphere in determining the position and thickness...impact of an accretion flow on the chromosphere of a CTTS, including the effects of...tested detailed model of the stellar chromosphere. We present the results of a simulation...
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Research from A. Vecchio et al has provided new information about science.
Newspaper article from: Network Weekly News; 3/16/2009; 700+ words
; ...The exact nature of the quiet solar chromosphere and especially its temporal variation...dynamics of the quiet inter-network chromosphere by studying the occurrence of acoustic...role in structuring the quiet solar chromosphere than normally assumed. The presence...
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The Day on Fire
Magazine article from: Antigonish Review; 1/1/2007; ; 700+ words
; ...above the seething visible surface is called the chromosphere. The chromosphere is still a "quiet" aspect of the Sun, even...s visible emissions are so powerful, the chromosphere is essentially invisible, except in the moment...
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Studies from University of Utrecht further understanding of solar physics.
Newspaper article from: Physics Week; 9/30/2008; 675 words
; ...sampling to study the response of the chromosphere to acoustic events in the underlying...first compare the visibility of the chromosphere in Ca II H and H alpha, demonstrate that studying the chromosphere requires H alpha data, and summarize...
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chromosphere
Book article from: The Columbia Encyclopedia, Sixth Edition
chromosphere [Gr.,=color sphere], layer of rarefied...Composition and Characteristics of the Chromosphere The flash spectrum has been a valuable tool in the study of the chromosphere. This spectrum is obtained before a solar...
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Sun
Encyclopedia entry from: UXL Encyclopedia of Science
...billion more years. Words to Know Chromosphere: Glowing layer of gas that makes up...general layers: the photosphere, the chromosphere, and the corona. Since these layers...cooler than the surrounding area. Chromosphere. Beyond the photosphere lies the chromosphere...
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Sun (Stellar Structure)
Book article from: World of Earth Science
...29 days near the polar regions. The chromosphere surrounds the photosphere and extends...miles. Temperatures increase in the chromosphere and range up to 1,000,000 K. The chromosphere is part of the solar corona that extends...
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active region
Book article from: A Dictionary of Astronomy
...emerge through the photosphere into the chromosphere and corona. Active regions on the photosphere...faculae . Their counterparts higher in the chromosphere are plages . Also in the chromosphere are dark fibrilles and filaments . Active...
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solar atmosphere
Book article from: A Dictionary of Astronomy
...the Sun including the photosphere , chromosphere , transition region , and corona...dissipation of sound waves (in the low chromosphere) and magnetohydrodynamic waves (in the rest of the chromosphere and corona), or heating following...
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