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- Title
Discovery of Alfvén Waves Planetward of Saturn's Rings.
- Authors
Southwood, D. J.; Cao, H.; Shebanits, O.; Elsden, T.; Hunt, G. J.; Dougherty, M. K.
- Abstract
Between April and September 2017 in the final stages of the Cassini Saturn Orbiter mission the spacecraft executed 22 orbits passing planetward of the innermost ring, the D-ring. During all periapsis passes oscillations were detected in the azimuthal magnetic field components on typical time scales of a few minutes. We argue that these time-varying magnetic signals detected on the spacecraft are also primarily time-varying in the plasma frame. Furthermore, we show that nearly all signals exhibit a spatial feature, namely a magnetic node near the effective field line equator. We propose that the oscillations are associated with Alfvén waves excited in local field line resonances, most likely driven from global sources.
- Subjects
RING currents; CASSINI (Spacecraft); MAGNETIC fields; ELECTROMAGNETIC oscillations; RESONANCE
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 2, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2020JA028473