New answers tagged exoplanet
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Why would surface flux include radiation pointing inward the target?
You are not integrating the flux in all directions as indicated in your sketch. The integration is summing up the contributions over all (visible) latitudes and longitudes to the flux in a particular ...
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Vectorized definition of flux yields counter-intuitive result
If the specific intensity is isotropic, then indeed the net flux through a surface is zero.
I am not sure what you mean by a perfectly radiating source, but the radiation field say at the photosphere ...
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Surface flux in a specific direction: why is specific intensity in other directions allowed to contribute?
Flux, in terms of power per unit area is in general direction-dependent, unless the radiation is isotropic.
For example, the power emitted by a dipole is zero along its axis and at a maximum for a ...
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