A Jovian decametric emission event observed locally by Juno and remotely by Wind and STEREO-A at 1 AU

Juno in-situ observations provide insightful data on plasma, electric, and magnetic fields associated with Jovian decametric (DAM) emission, while remote-sensing observations have the advantage of large spatial and temporal scales. Combining these two perspectives may help us understand the dynamic processes of DAM radiation. In this work, we present an Io-DAM emission continued intermittently for at least 2 hours combining Juno in-situ observation and remote-sensing observation from Wind and Stereo-A. The Io-DAM emission evolved from three discrete narrow arcs to one mixed broad arc within 11 minutes in remote-sensing dynamic spectra. This Io-DAM source is located at a lead angle of 6° from the main Alfvén wing spot (MAW) lasting for the observation. Juno/JADE detected peaks of electron energy fluxes and showed the loss-cone distribution in the upgoing direction. We set a series of resonant circles to estimate the maximum growth rate 8*10^-4, which yields an electron energy range of 0.2–3 keV and an emission angle of 84°-88°. Meanwhile, we infer the properties of the source region of the event from the remote-sensing observations at 1 AU. The inversed results on electron energy, emission angle, and source locations are consistent with the Juno in-situ observations, which may indicate the consistent properties of this Io-DAM event over 2-hour observational intervals. This consistency also reinforces the reliability of the remote sensing inversion method. Our work contributes to the establishment of long-term stereoscopic remote monitoring, addressing limitations in local observational coverage and enhancing our understanding of the dynamic processes of DAM emission.