Electron periodicities in Saturn's outer magnetosphere

Details Electron periodicities in Saturn's outer magnetosphere Electron periodicities in Saturn's outer magnetosphere

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11203206c&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A3, CiteID A03206

Physics

15

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Planetary Sciences: Solar System Objects: Saturn, Planetary Sciences: Fluid Planets: Magnetospheres (2756)

Scientific paper

The Magnetospheric Imaging Instrument/Low-Energy Magnetospheric Measurements Sensor (MIMI/LEMMS) instrument on the Cassini spacecraft has measured energetic electrons in the energy range 20-300 keV within Saturn's magnetosphere. In the outer magnetosphere, beyond ~20 R S , these electrons and their spectral index display strong variations with periods comparable to the 10.76 hour (10 hours, 45 min, 36 s) period measured by radio observations of Cassini. Inside ~20 R S , such electron variations may be present but are masked by satellite and ring effects. Electron periodicities are most easily recognized on the ``nightside'' segments of the Cassini orbits, although they are also observed to some extent on the dayside. For both dayside and nightside a wavelet analysis of detrended count rates in the 20-40 R S region reveals a mean period of 10.52 +/- 0.74 hours (10 hours, 31 min +/- 44 min) for the six electron channels investigated. If constrained to the nightside only, a wavelet analysis gives a mean period of 10.88 +/- 0.52 hours (10 hours, 53 min +/- 31 min). Covering five orbits of the Cassini spacecraft during the 2-year period from Saturn Orbit Insertion (July 2004 to July 2006), this analysis indicates that a day-night asymmetry exists in the electron periodicity in Saturn's outer magnetosphere and suggests that dayside periodicities are much less prominent than nightside or dawnside periodicities.

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