Fractional quantum Hall effect: Difference between revisions

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[[File:Sun poster.svg|thumb|right|420px|An illustration of the structure of the Sun]]
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The '''radiation zone''' or '''radiative zone''' is a layer of a star's interior where energy is primarily transported toward the exterior by means of [[radiation|radiative diffusion]], rather than by [[convection]].<ref name=ryan_norton2010/> Energy travels through the radiation zone in the form of [[electromagnetic radiation]] as [[photon]]s. Within the Sun, the radiation zone is located in the intermediate zone between the [[solar core]] at .2 of the Sun's radius and the outer [[convection zone]] at .71 of the Sun's radius.<ref name=ryan_norton2010/>


Matter in a radiation zone is so dense that photons can travel only a short distance before they are absorbed or scattered by another particle, gradually shifting to longer wavelength as they do so. For this reason, it takes an average of 171,000 years for [[gamma ray]]s from the core of the Sun to leave the radiation zone. Over this range, the temperature of the plasma drops from 15 million K near the core down to 1.5 million K at the base of the convection zone.<ref name=elkins_tanton2006/>
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Within a radiative zone, the temperature gradient—the change in temperature (''T'') as a function of radius (''r'')—is given by:
 
: <math>\frac{\text{d}T(r)}{\text{d}r}\ =\ -\frac{3 \kappa(r) \rho(r) L(r)}{(4 \pi r^2)(16 \sigma) T^3(r)}</math>
 
where ''κ''(''r'') is the [[Opacity (optics)|opacity]], ''ρ''(''r'') is the matter density, ''L''(''r'') is the luminosity, and ''σ'' is the [[Stefan–Boltzmann constant]].<ref name=ryan_norton2010/> Hence the opacity (''κ'') and radiation flux (''L'') within a given layer of a star are important factors in determining how effective radiative diffusion is at transporting energy. A high opacity or high luminosity can cause a high temperature gradient, which results from a slow flow of energy. Those layers where convection is more effective than radiative diffusion at transporting energy, thereby creating a lower temperature gradient, will become [[convection zone]]s.<ref name=leblanc2011/>
 
For [[main sequence]] stars—those stars that are generating energy through the [[thermonuclear fusion]] of hydrogen at the core, the location of the radiative zone depends on the star's mass. Main sequence stars below about 0.3 [[solar mass]]es are entirely convective, meaning they do not have a radiative zone. From 0.3 to 1.2 solar masses, the region around the stellar core is a radiation zone, separated from the overlying convection zone by the [[tachocline]]. The radius of the radiative zone increases [[Monotonic function|monotonically]] with mass, with stars around 1.2 solar masses being almost entirely radiative. Above 1.2 solar masses, the core region becomes a convection zone and the overlying region is a radiation zone, with the amount of mass within the convective zone increasing with the mass of the star.<ref name=padmanabhan2001/>
 
==Notes and references==
{{Reflist|refs=
 
<ref name=ryan_norton2010>{{citation | first1=Sean G. | last1=Ryan | first2=Andrew J. | last2=Norton | title=Stellar Evolution and Nucleosynthesis | publisher=Cambridge University Press | year=2010 | isbn=0-521-19609-4 | page=19 | url=http://books.google.com/books?id=V8rBIudlniAC&pg=PA19 }}</ref>
 
<ref name=leblanc2011>{{citation | first1=Francis | last1=LeBlanc | year=2011 | title=An Introduction to Stellar Astrophysics | edition=2nd | publisher=John Wiley and Sons | isbn=1-119-96497-0 | page=168 | url=http://books.google.com/books?id=jAe4P3GIZRoC&pg=PA168 }}</ref>
 
<ref name=elkins_tanton2006>{{citation | first1=Linda T. | last1=Elkins-Tanton | title=The Sun, Mercury, and Venus | publisher=Infobase Publishing | year=2006 | isbn=0-8160-5193-3 | page=24 | url=http://books.google.com/books?id=Kx6q_fyqIKYC&pg=PA24 }}</ref>
 
<ref name=padmanabhan2001>{{citation | first1=Thanu | last1=Padmanabhan | title=Theoretical Astrophysics: Stars and stellar systems | volume=2 | series=Theoretical Astrophysics | publisher=Cambridge University Press | year=2001 | isbn=0-521-56631-2 | page=80 | url=http://books.google.com/books?id=TOjwtYYb63cC&pg=PA80 }}</ref>
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==External links==
* [http://sohowww.nascom.nasa.gov/ SOHO ... '''So'''lar and '''H'''eliospheric '''O'''bservatory] — official site of this [[NASA]] and [[European Space Agency|ESA]] joint project.
* [http://alienworlds.southwales.ac.uk/sunStructure.html#/radiativezone Animated explanation of the Radiation zone ] (University of South Wales).
* [http://alienworlds.southwales.ac.uk/sunStructure.html#/radiativetempden Animated explanation of the temperature and density of the Radiation zone] (University of South Wales).
 
{{The Sun|state=uncollapsed}}
{{Star}}
 
{{DEFAULTSORT:Radiation Zone}}
[[Category:Sun]]

Latest revision as of 14:56, 2 December 2014

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