Fig. 3.

Strength of electromagnetic interactions (ωpe/νne) as a result of LyC irradiation compared to thermal ionisation in brown dwarf atmospheres in different Galactic environments. Top: (case ii) O3 star at a distance of 0.5 pc (star-forming region). Middle: (case i) ISRF. Bottom: (case ii) white dwarf – brown dwarf binary system such as WD0837+185 with d = 0.006 AU. Young brown dwarf atmospheres (log(g) = 3.0) and old brown dwarf atmospheres (log(g) = 5.0) are plotted.
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