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Radiation layerIt's the radiation inside the star, notconvectionThe area where energy is transmitted outwards by means ofelectromagnetic radiation, likephoton, through the radiation layer.
Inside the sun, the radiation layer is locatedSolar coreandtroposphereFrom 0.2 to 0.71 solar radius.
Matter has a high density in the radiation layer. Photons can only travel a short distance freely, and will be absorbed or scattered into another particle. In this process, they will gradually transfer to a longer wavelength.For this reason, it takes an average of 171000 years for gamma rays leaving the core region of the sun to pass through the radiation region.Within this range, the temperature of the plasma drops from 15 million K in the core to about 1.5 million K at the bottom of the troposphere.
Functional relation
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In the radiation layer, temperature gradient - temperature（T）Change is radius（r）The function of is given by the following formula:
Here,κ（r）YesOpacity，ρ（r）Is the density of the material,L（r）Is brightness, andσyesStefan Boltzmann constant。Therefore, opacity（κ）And radiation flux（L）Within a given region of a star is the factor that determines how effectively radiation diffuses and transports energy.High opacity or brightness will cause high temperature gradient, which is the result of slow energy flow.In terms of energy transmission,troposphereIt will diffuse energy more efficiently than the radiation layer, thus creating a lower temperature gradient and becomingtroposphere。
position
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yesMain sequence star- Hydrogen corenuclear fusionThe position of the radiant layer of a star that generates energy depends on its mass.Mass below 0.3Solar massThe main sequence star oftroposphere, which means they have no radiation layer.From 0.3 to 1.2 solar mass, surrounding the core area is the radiation layer, which is covered withCyclotron layer, connect it withtroposphereSeparate.The radius of the radiation layer is massfunctionThe radius will only increase with the increase of mass. The whole star with 1.2 solar mass is almost a radiation layer.The core region of a star with a solar mass of more than 1.2 will become the troposphere, which is covered with a radiation layer. The mass in the troposphere will increase with the increase of the total mass of the star.
