Estimating Jupiter’s Gravity Field UsingJunoMeasurements, Trajectory Estimation Analysis, and a Flow Model Optimization
| Autor: | Daniele Durante, Eli Galanti, Luciano Iess, Stefano Finocchiaro, Yohai Kaspi |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Gravity (chemistry) gravitation hydrodynamics planets and satellites: gaseous planets planets and satellites: individual ( Jupiter Saturn ) 010504 meteorology & atmospheric sciences Astronomy and Astrophysics Geodesy 01 natural sciences Jovian Jupiter Gravitation Gravitational field Space and Planetary Science Harmonics Physics::Space Physics 0103 physical sciences Trajectory Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics 0105 earth and related environmental sciences Remote sensing Radio Science |
| Zdroj: | The Astronomical Journal. 154:2 |
| ISSN: | 1538-3881 |
| Popis: | The upcoming Juno spacecraft measurements have the potential of improving our knowledge of Jupiter's gravity field. The analysis of the Juno Doppler data will provide a very accurate reconstruction of spatial gravity variations, but these measurements will be very accurate only over a limited latitudinal range. In order to deduce the full gravity field of Jupiter, additional information needs to be incorporated into the analysis, especially regarding the Jovian flow structure and its depth, which can influence the measured gravity field. In this study we propose a new iterative method for the estimation of the Jupiter gravity field, using a simulated Juno trajectory, a trajectory estimation model, and an adjoint-based inverse model for the flow dynamics. We test this method both for zonal harmonics only and with a full gravity field including tesseral harmonics. The results show that this method can fit some of the gravitational harmonics better to the "measured" harmonics, mainly because of the added information from the dynamical model, which includes the flow structure. Thus, it is suggested that the method presented here has the potential of improving the accuracy of the expected gravity harmonics estimated from the Juno and Cassini radio science experiments. |
| Databáze: | OpenAIRE |
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