Journal article
Source region and growth analysis of narrowband Z-mode emission at Saturn
Journal of geophysical research. Space physics, Vol.121(12), pp.11929-11942
12/01/2016
DOI: 10.1002/2016JA022913
Abstract
Intense Z-mode emission is observed in the lower density region near the inner edge of the Enceladus torus at Saturn, where these waves may resonate with MeV electrons. The source mechanism of this emission, which is narrow-banded and most intense near 5 kHz, is not well understood. We survey the Cassini Radio and Plasma Wave Science data to isolate several probable source regions near the inner edge of the Enceladus density torus. Electron phase space distributions are obtained from the Cassini Electron Spectrometer, part of the Cassini Plasma Spectrometer investigation. We perform a plasma wave growth analysis to conclude that an electron temperature anisotropy and possibly a weak loss cone can drive the Z mode as observed. Electrostatic electron acoustic waves and perhaps weak beam modes are also found to be unstable coincident with the Z mode. Quasi-steady conditions near the Enceladus density torus may result in the observations of narrowband Z-mode emission at Saturn.
Details
- Title: Subtitle
- Source region and growth analysis of narrowband Z-mode emission at Saturn
- Creators
- J. D. Menietti - University of IowaP. H. Yoon - University of Maryland, College ParkD. Pisa - Czech Academy of Sciences, Institute of Atmospheric PhysicsS. -Y. Ye - University of IowaO. Santolik - Inst Atmospher Phys ASCR, Prague, Czech RepublicC. S. Arridge - Lancaster UniversityD. A. Gurnett - University of IowaA. J. Coates - University College London
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.121(12), pp.11929-11942
- Publisher
- Amer Geophysical Union
- DOI
- 10.1002/2016JA022913
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 14
- Grant note
- Praemium Academiae award ST/N000722/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) 1550566 / Directorate For Geosciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO) 1415150 / JPL ST/K000977/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) BK21 plus program through the National Research Foundation - Ministry of Education of Korea AGS1550566 / NSF; National Science Foundation (NSF) GFT Foundation NNX11AM36G / NASA; National Aeronautics & Space Administration (NASA)
- Language
- English
- Date published
- 12/01/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627236302771
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