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| Titel |
Low-Energy Energetic Neutral Atom Imaging of Io Plasma and Neutral Tori |
| VerfasserIn |
Yoshifumi Futaana, Stas Barabash, Xiao-Dong Wang, Martin Wieser, Gabriella S. Wieser, Peter Wurz, Norbert Krupp, Pontus C. Brandt |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096619
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| Publikation (Nr.) |
 EGU/EGU2014-12129.pdf |
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| Zusammenfassung |
| Io’s plasma neutral tori play significant roles in the Jovian magnetosphere. We present a
feasibility study of measuring low-energy energetic neutral atoms (LENAs) generated
from the tori. We calculate the LENA flux between 10 eV and 3 keV, which covers
the energy range of the corotational plasma flow. The differential flux is typically
103–105cm-2sr-1s-1eV -1 near the energy of the corotation measured from the Ganymede
orbit. It is above the detection level of the planned LENA sensor that is to be flown to the
Jupiter system with a time integral of 0.01–1 seconds. The flux is typically observed from the
dawn side of Jupiter. The observed flux will exhibit periodicities though the assumed ENA
generation is time independent, which can be attributed to the Jovian magnetosphere rotation
and the rotation of Io around Jupiter. The energy spectra will exhibit dispersion signatures,
because of the non-negligible flight time of the LENAs from Io to the satellite. In
2030, the Jupiter exploration mission JUICE will conduct a LENA measurement
with a LENA instrument, the Jovian Neutrals Analyzer (JNA). From the LENA
observations collected by JNA, we will be able to derive characteristic quantities,
such as the density, velocity, velocity distribution function, and composition of
plasma-torus particles. We also discuss the possible physics to be explored by JNA
in addition to the constraints for operating the sensor and analyzing the obtained
dataset. |
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