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Record 1 of 5131
A theory for low-frequency waves observed at comet Giacobini-Zinner
Author and Affiliation:
Goldstein, M. L.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Wong, H. K.(Southwest Research Institute, San Antonio, TX, United States)
Abstract: As the ICE spacecraft approached comet Giacobini-Zinner, low-frequency waves in two frequency ranges were observed in the magnetic field data. Under certain conditions, a gyrating beam of water group ions is capable of generating electromagnetic waves with periods near 100 s (in the spacecraft frame of reference) and shorter-period whistler branch waves with periods near 3 s. The 100-s wave can arise from either a nonresonant firehose instability or a resonant beam driven instability so long as the angle between the directions of the local magnetic field and solar wind velocity is less than 90 percent. Whenever that angle exceeds about 30 percent, the gyrating ring distribution formed by newly ionized water is also unstable to the generation of whistler waves with 3-s periods.
Publication Date: May 01, 1987
Document ID:
19870053930
(Acquired Nov 28, 1995)
Accession Number: 87A41204
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 92; 4695-470
Publisher Information: United States
Contract/Grant/Task Num: NSF ATM-84-05536
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Southwest Research Inst.; San Antonio, TX, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BOW WAVES; ELECTROMAGNETIC RADIATION; GIACOBINI-ZINNER COMET; HEAVY IONS; LOW FREQUENCIES; MAGNETOHYDRODYNAMIC STABILITY; CIRCULAR POLARIZATION; MAXWELL-BOLTZMANN DENSITY FUNCTION; POLARIZATION (WAVES); WHISTLERS
Imprint And Other Notes: Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4695-4700.
Availability Source: Other Sources
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