Pitch angle and energy diffusions by interaction between energetic electrons and neutral particles in Saturn's inner magnetosphere

Details Pitch angle and energy diffusions by interaction between energetic electrons and neutral particles in Saturn's inner magnetosphere Pitch angle and energy diffusions by interaction between energetic electrons and neutral particles in Saturn's inner magnetosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p13a1303t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P13A-1303

Physics

2730 Magnetosphere: Inner, 2732 Magnetosphere Interactions With Satellites And Rings, 2756 Planetary Magnetospheres (5443, 5737, 6033), 2774 Radiation Belts, 6275 Saturn

Scientific paper

Neutral particles in Saturn's inner magnetosphere play the dominant role in a loss of energetic electrons and ions because of abundance of neutral particles (e.g., Paranicas et al., 2007; Sittler et al., 2008). The estimation of interaction between energetic and neutral particles gives a clue to understand particle acceleration and loss processes. These interactions produce the butterfly type pitch angle distribution which is dominant distribution in Saturn's inner magnetosphere (e.g., Roussos et al., 2005). In order to understand loss processes of energetic electrons, we have estimated pitch angle diffusion coefficients by interaction between energetic electrons (> keV) and neutral particles. A result showed that diffusion coefficients by neutral particles are greater than those by electron-ion interactions around Enceladus (L~3.94). We have further estimated pitch angle and energy diffusion coefficients in Saturn's inner magnetosphere by using water molecule distribution model. The neutral distribution follows Saturn's and Enceladus's gravity fields after neutral particles are ejected from Enceladus into the magnetosphere due to sputtering. In this presentation, we will show an importance of energetic electron loss process by interaction between energetic electrons and neutral particles.

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