Fig. 4.

Magnetic Reynolds number, Rm (vflow = 106 cm s−1) as result of LyC irradiation compared to thermal ionisation in different Galactic environments: Top: young brown dwarfs in a star-forming region (O3 star, d = 0.5 pc). Middle: old brown dwarf in a star-forming region (O3 star, d = 0.5 pc). Bottom: old brown dwarf in a white dwarf binary system such as WD0837+185 with d = 0.006 AU.
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