The investigation of spatially-resolved solar plasma features in terms of radiometric measurements requires concepts different from those useful for full-Sun observations. After a definition of the relevant physical quantities, formulae are derived for studies of optically-thick and optically-thin plasmas observed with both spectral and spatial resolution. Simple examples of their applications to the determination of electron densities and electron temperatures as well as to studies of emission measures and elemental abundances are discussed.
ISSI Scientific Reports Series
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