Synchrotron radiation belts at Jupiter - Juno's MWR observations versus modeling results
Abstract
Close to Jupiter, thermal and non-thermal emissions from the atmosphere and magnetosphere are captured by Juno's remote-sensing experiment, the Microwave Radiometer (MWR). Additionally, signatures of in situ charged particles and magnetic field information are collected by other scientific instruments on the Juno spacecraft. Accomplishing the goal of obtaining atmospheric composition retrieval values from Jupiter's observed low-frequency radiative signature via MWR requires the separation of contributions from three emission sources: the cosmic microwave background (CMB), the planet and synchrotron radiation belts. The numerical treatment of data involves refinement of a higher-fidelity model for the synchrotron emission than the multi-parameter, multi-zonal model of Levin et al. (2001), based on the in-situ data. This model employs an empirical electron-energy distribution, which has been adjusted exclusively from Very Large Array (VLA) observations made prior to the Juno mission. Improvements on the electron energy distribution make use of the cumulative MWR perijove observations to optimize the electron distribution parameters with the goal of matching the synchrotron emission observed along its lines of sight. The approaches considered and challenges encountered in performing this task are further discussed here. The model will be regularly updated as additional observations from the MWR and magnetometer instruments become available.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.P41A3399A
- Keywords:
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- 5706 Aurorae;
- PLANETARY SCIENCES: FLUID PLANETS;
- 5714 Gravitational fields;
- PLANETARY SCIENCES: FLUID PLANETS;
- 5724 Interiors;
- PLANETARY SCIENCES: FLUID PLANETS;
- 6220 Jupiter;
- PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS