[P-PS08] 惑星科学

[PPS08-P17] A multi-instrument analysis of Juno data to investigate the sources of non-thermal radiation at Jupiter

*Daniel Santos-Costa¹、Scott Bolton¹、Steven Levin²、Fabiano Oyafuso²、Shannon Brown²、Michael Janssen²、Samuel Gulkis²、Amadeo Bellotti³、Paul Steffes³、Virgil Adumitroaie²、Jack Connerney⁴、George Clark⁵、Barry Mauk⁵、Heidi Becker²、John Jorgensen⁶、Vincent Hue¹、Joshua Kammer¹、Randy Gladstone¹、Thomas Greathouse¹、Bertrand Bonfond⁷、Frederic Allegrini¹、Phil Valek¹、William Kurth⁸、George Hospodarsky⁸、Emma Bunce⁹、Fran Bagenal¹⁰ (1.Southwest Research Institute、2.JPL/CalTech、3.Georgia Institute of Technology、4.NASA Goddard Space Flight Center、5.JHU/APL、6.DTU Space、7.LPAL、8.University of Iowa、9.University of Leicester、10.LASP)

キーワード：Jupiter, Juno, Magnetosphere, Electron Beams

Since August 2016, the Juno MicroWave Radiometer (MWR) has continuously measured the radiation emitted by Jupiter and the surrounding environment, over a frequency range from 0.6 to 22 GHz, from Juno’s highly elliptical 53-day polar orbit about Jupiter. The contributors to the strongest radio signals at the shorter frequencies are the thermal, cosmic microwave background, and synchrotron emission produced by the inner electron belt. Weaker but perceptible signatures in MWR are also reported at the shortest frequency during perijove 1 (PJ1) and PJ3-PJ11. Some of them are identified as a source of synchrotron emission produced by downward field-aligned MeV electrons in the middle magnetosphere. In this paper, we focus on synchrotron emissions originating from regions beyond Io's plasma torus that we believe to be linked to auroral activity. To support our findings, we discuss the results of a multi-instrument analysis of radio (MWR, WAVES), field (Juno magnetometer), extreme and far-ultraviolet auroral emission (Juno/UVS), plasma and energetic electron (JADE, JEDI) datasets, and background radiation signatures in Juno's ASC instrument for PJ1.