Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41a1650m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM41A-1650
Physics
2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
Narrowband emission is observed at Saturn centered typically near 5 kHz and 20 kHz and harmonics of each frequency. 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 probable source region at r = 5.8 RS, L = 6.9, lat = -23.7°, and local time = 3.3 hours. In situ electron distributions suggest narrowband emission has a source region associated with electrostatic cyclotron and upper hybrid emissions. 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 hybrid frequency is close to 2 fce or 3 fce (fce 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.
Coates Andrew J.
Gurnett Donald A.
Menietti Douglas J.
Rymer Abigail M.
Santolik Ondrej
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