Accession Number : ADP002180

Title :   Laboratory and Field Observations Related to Ice Particle and Aircraft Charging in Convective Storms,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HUNTSVILLE AL GEORGE C MARSHALL SPACE FLIGHT CENTER

Personal Author(s) : Christian,H. ; Lillie,L. ; Saunders,C. P. R. ; Hallett,J.

Report Date : 1983

Pagination or Media Count : 8

Abstract : Laboratory studies of graupel particle charging in simulated cloud conditions show the need for the presence of ice crystals and cloud water simultaneously except under conditions where secondary ice crystal production occurs, when charging initially occurs in the absence of ice crystals. The magnitude of the charging increases with size of ice crystal, and impact velocity; it is also sensitive to impurities. The magnitude of the charge is also sensitive to temperature and the sign changes between -10 and -20 deg C, depending on cloud liquid water content. Aircraft studies were carried out in Montana convective clouds to test the validity of the extrapolation of the laboratory data to the atmosphere from the viewpoint of generation of charge, electric field, and aircraft charging during cloud penetration. (Author)

Descriptors :   *Ice, Crystals, Clouds, Snow, Particles, Electric fields, Electric charge, Laboratory tests, Aircraft, Field tests, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE