The action of the solar corpuscular radiation on the rotational proper
ties of small interplanetary dust particles is investigated. It is sho
wn that the solar wind increases the angular momentum (spin) of the pa
rticle. Analytic solutions are presented for dominant terms in which q
uantities of the orders (v/u)(n), n greater than or equal to 1, are ne
glected (v is the orbital velocity of dust particle around the Sun and
u is the speed of the solar wind particles).