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Record 19 of 37568
Time scales for formation and spreading of velocity shells of pickup ions in the solar wind
Author and Affiliation:
Gaffey, J. D., Jr.(Maryland Univ., College Park, MD, United States)
Wu, C. S.(Maryland, University, College Park, United States)
Winske, D.(Los Alamos National Laboratory, NM, United States)
Abstract: This paper discusses the process of assimilation (pickup) by the solar wind of newly ionized atoms and molecules. Generally, the pickup process is considered to evolve in three stages: (1) the initial interaction of newly created ions with the interplanetary magnetic field to form the ring-beam distribution; (2) pitch angle scattering of the ring beam to form a hollow shell; and (3) slower velocity diffusion to form a partially filled-in shell distribution. Using numerical simulations of turbulence such as would occur naturally in the solar wind and such as would be encountered near cometary bow shocks, the processes of shell formation and evolution are studied, and the results are used to estimate the time scales for shell formation and diffusion in several situations of recent observational interest, the interstellar He data obtained by AMPTE and cometary ion pickup distributions obtained by various spacecraft at comets Giacobini-Zinner and Halley.
Publication Date: Jun 01, 1988
Document ID:
(Acquired Nov 28, 1995)
Accession Number: 88A40005
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 93; 5470-548
Publisher Information: United States
Contract/Grant/Task Num: NAGW-971; NGL-21-002-005
Financial Sponsor: NASA; United States
Organization Source: Maryland Univ.; College Park, MD, United States
Los Alamos National Lab.; NM, United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Imprint And Other Notes: Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5470-5486. DOE-supported research.
Miscellaneous Notes: DOE-supported research
Availability Source: Other Sources
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