Journal article
Source mechanism of Saturn narrowband emission
Annales geophysicae (1988), Vol.28(4), pp.1013-1021
04/27/2010
DOI: 10.5194/angeo-28-1013-2010
Abstract
Narrowband emission (NB) is observed at Saturn centered near 5 kHz and 20 kHz and harmonics. This emission appears similar in many ways to Jovian kilometric narrowband emission observed at higher frequencies, and therefore may have a similar source mechanism. Source regions of NB near 20 kHz are believed to be located near density gradients in the inner magnetosphere and the emission appears to be correlated with the occurrence of large neutral plasma clouds observed in the Saturn magnetotail. In this work we present the results of a growth rate analysis of NB emission (similar to 20 kHz) near or within a probable source region. This is made possible by the sampling of in-situ wave and particle data. The results indicate waves are likely to be generated by the mode-conversion of directly generated Z-mode emission to O-mode near a density gradient. When the local hybrid frequency is close n f(ce) (n is an integer and f(ce) is the electron cyclotron frequency) with n=4, 5 or 6 in our case, electromagnetic Z-mode and weak ordinary (O-mode) emission can be directly generated by the cyclotron maser instability.
Details
- Title: Subtitle
- Source mechanism of Saturn narrowband emission
- Creators
- J. D. Menietti - University of IowaP. H. Yoon - University of Maryland, College ParkSheng-Yi Ye - Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USAB. Cecconi - Johns Hopkins University Applied Physics LaboratoryA. M. Rymer - Johns Hopkins University
- Resource Type
- Journal article
- Publication Details
- Annales geophysicae (1988), Vol.28(4), pp.1013-1021
- Publisher
- Copernicus Gesellschaft Mbh
- DOI
- 10.5194/angeo-28-1013-2010
- ISSN
- 0992-7689
- eISSN
- 1432-0576
- Number of pages
- 9
- Grant note
- 1356500 / NASA; National Aeronautics & Space Administration (NASA) ANT 0838647 / NSF; National Science Foundation (NSF) R31-10016 / Korean Ministry of Education, Science and Technology; Ministry of Education, Science & Technology (MEST), Republic of Korea
- Language
- English
- Date published
- 04/27/2010
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627310602771
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