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Record Details

Record 1 of 27070
The electric field alignment of ice particles in thunderstorms
Author and Affiliation:
Weinheimer, Andrew J.(National Center for Atmospheric Research, Boulder, CO, United States)
Few, Arthur A.(Rice University, Houston, TX, United States)
Abstract: Electrical and aerodynamic torques on atmospheric ice particles are calculaed in order to assess the degree of alignment of these particles with the electric fields in thunderstorms. In such clouds fields of many tens of kilovolts per meter are commonly measured, and values of 100 to 200 kV/m are not rare. For E = 100 kV/m the calculations indicate that electric field alignment occurs for crystals with major dimensions up to maximum values in the range from 200 microns to 1 mm, depending upon crystal type. Columns are aligned more easily than platelike crystals, except for dendrites which, by virtue of their smaller assumed density, have smaller fall velocities thereby experiencing weaker aerodynamic torques. Thus a substantial degree of alignment is expected for E = 100 kV/m. For E = 10 kV/m only much smaller crystals will be aligned, probably only ones with major dimensions of less than 50 microns or so.
Publication Date: Dec 20, 1987
Document ID:
19880038061
(Acquired Nov 28, 1995)
Accession Number: 88A25288
Subject Category: METEOROLOGY AND CLIMATOLOGY
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 92; 14833-14
Publisher Information: United States
Contract/Grant/Task Num: N00014-77-C-0154; N00014-75-C-0139; NAS8-33023; NSF ATM-80-16164; NSF ATM-81-11715; NGL-44-006-012
Financial Sponsor: NASA; United States
Organization Source: National Center for Atmospheric Research; Boulder, CO, United States
Rice Univ.; Houston, TX, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AERODYNAMIC FORCES; ALIGNMENT; CLOUDS (METEOROLOGY); ELECTRIC FIELDS; ICE NUCLEI; THUNDERSTORMS; CRYSTALS; DIELECTRICS; PARTICLE MOTION; REYNOLDS NUMBER; STOKES LAW (FLUID MECHANICS); TURBULENCE
Imprint And Other Notes: Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Dec. 20, 1987, p. 14833-14844.
Availability Source: Other Sources
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