Fig. 1

Spherical model of a star cluster embedded in a HII region. The interstellar bubble (or region 1) has a radius Rb. The HII region (or region 2) has an outer radius of RHII and is characterized by the density n, magnetic field strength B, intensity of the magnetic turbulence level δB, and index of turbulence ν. The interstellar bubble is much smaller than the HII region, Rb ≪ RHII.
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