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| Titel |
Empirical probability model of cold plasma environment in the Jovian magnetosphere |
| VerfasserIn |
Yoshifumi Futaana, Xiao-Dong Wang, Stas Barabash, Elias Roussos, Pete Truscott |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113023
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| Publikation (Nr.) |
 EGU/EGU2015-13217.pdf |
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| Zusammenfassung |
| We analyzed the Galileo PLS dataset to produce a new cold plasma environment model for
the Jovian magneto- sphere. Although there exist many sophisticated radiation models,
treating energetic plasma (e.g. JOSE, GIRE, or Salammbo), only a limited number of simple
models has been utilized for cold plasma environment. By extend- ing the existing
cold plasma models toward the probability domain, we can predict the extreme
periods of Jovian environment by specifying the percentile of the environmental
parameters.
The new model was produced in the following procedure. We first referred to
the existing cold plasma models of Divine and Garrett, 1983 (DG83) or Bagenal
and Delamere 2011 (BD11). These models are scaled to fit the statistical median
of the parameters obtained from Galileo PLS data. The scaled model (also called
as "mean model") indicates the median environment of Jovian magnetosphere.
Then, assuming that the deviations in the Galileo PLS parameters are purely due to
variations in the environment, we extended the mean model toward the percentile
domain.
The input parameter of the model is simply the position of the spacecraft (distance,
magnetic longitude and lati- tude) and the specific percentile (e.g. 0.5 for the mean model).
All the parameters in the model are described in mathematical forms; therefore the needed
computational resources are quite low.
The new model can be used for assessing the JUICE mission profile. The spatial extent of
the model covers the main phase of the JUICE mission; namely from the Europa orbit to 40
Rj (where Rj is the radius of Jupiter). In addition, theoretical extensions toward the latitudinal
direction are also included in the model to support the high latitude orbit of the JUICE
spacecraft. |
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