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- Title
Cassini RPWS Dust Observation Near the Janus/Epimetheus Orbit.
- Authors
Ye, S.‐Y.; Kurth, W. S.; Hospodarsky, G. B.; Persoon, A. M.; Gurnett, D. A.; Morooka, M.; Wahlund, J.‐E.; Hsu, H.‐W.; Seiß, M.; Srama, R.
- Abstract
During the Ring Grazing orbits near the end of Cassini mission, the spacecraft crossed the equatorial plane near the orbit of Janus/Epimetheus (~2.5 Rs). This region is populated with dust particles that can be detected by the Radio and Plasma Wave Science (RPWS) instrument via an electric field antenna signal. Analysis of the voltage waveforms recorded on the RPWS antennas provides estimations of the density and size distribution of the dust particles. Measured RPWS profiles, fitted with Lorentzian functions, are shown to be mostly consistent with the Cosmic Dust Analyzer, the dedicated dust instrument on board Cassini. The thickness of the dusty ring varies between 600 and 1,000 km. The peak location shifts north and south within 100 km of the ring plane, likely a function of the precession phase of Janus orbit. Key Points: Dust particles have been detected near the Janus/Epimetheus orbit by Cassini RPWS and CDAFrom the RPWS measurements, dust density and size distribution can be derived, which is mostly consistent with CDA resultsRPWS data indicated that the dusty ring is slightly tilted and slowly precesses as it rotates around Saturn
- Subjects
DUST; PLASMA waves; PLASMA waveguides; COSMIC dust; INTERSTELLAR medium; LORENTZIAN function; ABSORPTION spectra
- Publication
Journal of Geophysical Research. Space Physics, 2018, Vol 123, Issue 6, p4952
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2017JA025112