Fig. 2

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Calculated Qpr value averaged over blackbody spectra of different temperatures ( in our notation). The
values are plotted as a function of the particle size ra and blackbody temperature T of the incident radiation for two minerals: a) olivine and b) magnetite. The emissivity ϵ is assumed to be constant, so
cancels out in Eq. (9). For olivine, three polarization directions with respect to the crystalline axes can lead to small differences in the results (three different markers; see Appendix A), and the average value (solid line) is used in this work.
converges tounity for a large particle limit, as predicted from the geometrical optics approximation.
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