Possible eigenmode trapping in density enhancements in Saturn's inner magnetosphere

Equatorial electron density measurements in Saturn’s inner magnetosphere

Electron density in the magnetosphere

[1] Observations of the electron density ne based on measurement of the upper hybrid resonance frequency by the Polar spacecraft Plasma Wave Instrument (PWI) are available for March 1996 to September 1997, during which time the Polar orbit sampled all MLT values three times. In a previous study, we modeled the electron density dependence along field lines as ne = ne0(Rmax/R) , where ne0 is the ...

Discovery of nitrogen in Saturn’s inner magnetosphere

[1] We detected N in Saturn’s magnetosphere in the range L 3.5 to 9.5 Saturn Radii (Rs) using data collected by the Cassini Plasma Spectrometer during Saturn Orbit Insertion and the following orbit (Rev A). The presence of N in Saturn’s magnetosphere has been a source of much debate since Voyager’s detection of unresolved mass/charge 14–16 amu ions in this region. Two principal nitrogen sources...

Two Transiting Low Density Sub-saturns from K2

We report the discovery and confirmation of K2-24 b and c, two sub-Saturn planets orbiting a bright (V= 11.3), metal-rich ([Fe/H]= 0.42±0.04 dex) G3 dwarf in the K2 Campaign 2 field. The planets are 5.68±0.56 RÅ and 7.82±0.72 RÅ and have orbital periods of 20.8851±0.0003 days and 42.3633±0.0006 days, near the 2:1 mean-motion resonance. We obtained 32 radial velocities with Keck/HIRE...

Density estimation in live-trapping studies

Unbiased estimation of population density is a major and unsolved problem in animal trapping studies. This paper describes a new and general method for estimating density from closed-population capture /recapture data. Many estimators exist for the size (N) and mean capture probability (p̄) of a closed population. These statistics suffer from an unknown bias due to edge effect that varies with t...