Abstract
There are some experimental reports on electrostatic charge measurements of blowing-snow particles in the field and wind tunnel. While there were qualitatively consistent in the sign; negative, there were gaps quantitatively between them. A reason of the gaps speculated widely is due to differences of the collision frequency of particles to the snow surface. The purpose of this experiment is to measure the charge of blowing-snow particles focusing on the collision frequency and clarify the relationship between them. Experiments were carried out in a cryogenic wind tunnel using spherical and dendritical snow particles under the following conditions: hard snow surface, air temperature in the range －20 to －5℃. The collision frequency of particle was controlled by changing the wind velocity (4.5 to 7ms-1) under the fixed fetch (12m). Blowing-snow particles tend to accumulate negative charges with increase of collision frequency to the snow surface. As a result, it is demonstrated that the gaps between the field values and the wind tunnel ones were due to difference of the collision frequency of snow particles.
