A

(Specific intensity; optically thin plasma)

This illustrates that the detected specific intensity is simply a measure of the product of the average volume emissivity jav along the line of sight times the thickness A of the cloud, if the cloud is transparent (optically thin) to the radiation of interest.

Line-of-sight emissivity (power column density)

According to (53), the specific intensity is proportional to the product javA (W m-2 Hz-1). This product is, by inspection, the total power generated (per Hz) in a column 1 m2 in cross section and A (m) in length (Fig. 9). In integral form, from (52), it is

(Line-of-sight emissivity; (8.54)

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