Abstract
Individual raindrops were sampled at four stations in mountain area of Hokkaido in the summer of 1954 and 1955 and the size distribution of giant non-hygroscopic particles in the raindrops was studied. The results of observations are as follows.
(1) The form of size distribution curve is independent of raindrop size and is expressed by a formula dN/dγ=const•γ-β, where γ is the radius of the particles. The value of β are between 1.7 and 3.2.
(2) Particle content of raindrops is approximately the same at various stations and is invariable with time.
(3) Particle content is roughly proportional to the cross-sectional area of raindrops except for the small raindrops of diameters less than 0.3mm.
