Figure 1.

(a) The flux of interplanetary meteoroids at 1 AU as a function of their size (mass), the labels indicate space missions, and $\beta$-meteoroids are IDPs on escaping orbits driven by radiation pressure [9]; (b) the modelled speed distribution, independent of the size of a meteoroid, scaled with the mass flux at the Moon (black solid line) and at Earth (blue solid line) [11,12].