Logarithm of cumulative particle flux at 1 AU distance from the Sun with respect to the logarithm of meteoroid mass adapted from Grün et al. (1985) (top panel). Mass index s for meteoroids at 1 AU distance from the Sun derived as the first derivative from the curve in the top panel (solid blue line) compared to the mass index s = 2.03 ± 0.01 for meteoroid environment measured by AMOR in 1995–1999 (Galligan & Baggaley 2004), mass index s = 2.05 ± 0.08 for background meteoroid environment from CMOR multi-frequency data, and with mass index s = 2.09 ± 0.05 derived from CAMO observations.