Journal article
Analysis of narrowband emission observed in the Saturn magnetosphere
Journal of geophysical research. Space physics, Vol.114(A6), pp.A06206-n/a
06/2009
DOI: 10.1029/2008JA013982
Abstract
Narrowband emission is observed at Saturn centered near 5 kHz and 20 kHz and harmonics of 20 kHz. This emission appears to be in many ways similar to Jovian narrowband emission observed at higher frequencies. We analyze one example of this emission near a possible source region. In situ electron distributions suggest narrowband emission has a source region associated with electrostatic cyclotron harmonic and upper hybrid emission. Linear growth rate calculations indicate that the observed plasma distributions are unstable to the growth of electrostatic harmonic emissions. In addition, it is found that when the local upper hybrid frequency is close to 2 f(ce) or 3 f(ce) (f(ce) is the electron cyclotron frequency), electromagnetic Z mode and weak ordinary (O mode) emission can be directly generated by the cyclotron maser instability. In the presence of density gradients, Z mode emission can mode-convert into O mode emission, and this might explain the narrowband emission observed by the Cassini spacecraft.
Details
- Title: Subtitle
- Analysis of narrowband emission observed in the Saturn magnetosphere
- Creators
- J. D. Menietti - University of IowaS. -Y. Ye - University of IowaP. H. Yoon - University of Maryland, College ParkO. Santolik - Charles UniversityA. M. Rymer - Johns Hopkins University Applied Physics LaboratoryD. A. Gurnett - University of IowaA. J. Coates - University College London
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.114(A6), pp.A06206-n/a
- Publisher
- Amer Geophysical Union
- DOI
- 10.1029/2008JA013982
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 13
- Grant note
- 0535821; 0638638; 0829309 / NSF; National Science Foundation (NSF) PP/E001173/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) 0638638 / Div Atmospheric & Geospace Sciences; Directorate For Geosciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO) PP/D00084X/1 / UK Space Agency 0535821 / Directorate For Geosciences; Div Atmospheric & Geospace Sciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO) PP/E001173/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) 1356500 / University of Iowa
- Language
- English
- Date published
- 06/2009
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627335002771
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