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Power-law energy distributions of small-scale impulsive events on the active Sun: results from IRIS

Ramsay, Gavin; Mathioudakis, Mihalis; Doyle, J. Gerry +2 more

Numerous studies have analysed inferred power-law distributions between frequency and energy of impulsive events in the outer solar atmosphere in an attempt to understand the predominant energy supply mechanism in the corona. Here, we apply a burst detection algorithm to high-resolution imaging data obtained by the Interface Region Imaging Spectro…

Some thoughts on emission-line spectroscopy

Judge, Philip G.

The interpretation of emission lines formed in large astrophysical plasmas such as the solar atmosphere faces many challenges. Relatively simple line-ratio estimates of physical parameters, while appealing, are heavily laden with assumptions. In practical cases, some critical assumptions are neither defensible from first principles, nor testable b…