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unit of the spectrum #268

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choryu0270 opened this issue Nov 6, 2019 · 1 comment
Open

unit of the spectrum #268

choryu0270 opened this issue Nov 6, 2019 · 1 comment

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@choryu0270
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As an example I am trying to use Chianti to calculate the H-alpha line, seems it only need two parameters, temperature and eDensity.
And the spectrum intensity has a unit of "erg cm−2 s−1 sr−1 A-1", I believe it is common used in the astronomy. I am confused about it as the radiation power should be related to the distance, what's the default setting of the "radiation source distance" of Chianti's calculation ? If I want to estimate the laboratory plasmas the intensity should be different.

@kdere
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kdere commented Nov 6, 2019

Hi,
the units already include the distance information. You can use the cm^-2 as the area of your detector or the area of the source. Similarly, the sr^-1 is the steradians of the source or your detector.

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