So the radiometric term "radiant flux" is arguably a misuse of the word "flux", though I doubt radiometrists are losing sleep over this. the amount of water that flows through a cross-section of the river each second, or the amount of sunlight energy that lands on a patch of ground each second, are kinds of flux."). For example, the magnitude of a river's current, i.e. The area is of the surface the property is flowing "through" or "across". Luminosity - total power emitted by an object, with units of energy per time (e.g. Specifically, in astrophysics we most commonly use the following terms A fundamental term in the quantification of light used by plants in the. I think the confusion you're having stems from the fact that there are different terms for the same phenomena being used in different fields, and some of these terms use the same underlying words, but in different, inconsistent ways. It is expressed either in terms of photosynthetic photon flux density (PPFD, mol photons m 2 s 1), since photosynthesis is a quantum process, or in terms of photosynthetic radiant flux density (PAR irradiance, W m 2), more suitable for energy balance studies. I'm just sharing my confusion with you guys, please help me with that question. Probably I'm making it complicated for myself and it's not that hard to understand. In that case the bolometric magnitude should be calculated with the integral of Irradiance, not Luminosity nor Flux right? That doesn't mean if Irradiance is equal to Radiant Flux divided by Area, so F = I*A that would make Irradiance equal Luminosity / Area^2 ? Which means that Irradiance is Flux divided by Area, so Radiant Flux has units of J/s and Irradiance has units of W m^-2 which I remember from my Optics class, then again Carroll & Ostlie say that: In radiometry, irradiance is the radiant flux (power) received by a surface per unit area. In Carroll & Ostlie book "An Introduction to Modern Astrophysics" even say that:Īnd Wikipedia's Irradiance on Earth's surface says this:Īverage annual solar radiation arriving at the top of the Earth's atmosphere is roughly 1361 W/m².įollowing this I first I assume that Irradiance and Radiative Flux are the same thing, but when searching for Irradiance on Wikipedia says that: My question is that I have seen many texts which says that Radiative Flux is equal to the Irradiance of a star. First of all I know there is a similar question here, but I feel is wasn't answered at all.
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