Spatial and Temporal Variability of Southern Auroral Emissions in the IR fromJIRAM/Juno Data

JIRAM is the imaging spectrometer on board the NASA Juno mission. Data collected since August 2016 on both Jupiter Northern and Southern aurora have an unprecedent spatial resolution. Moreover, JIRAM scanning mirror allows observations of the same area at serveral adiacent time frames. In this work we focus on the spatial and temporal variability of the Southern aurora. JIRAM data of the L imager channel have been averaged in bins of 2.5°LAT × 2°LON and variations of the signal have been investigated for 17h50m < time < 19h45m, 27 August 2016. Time frames have been carefully selected in order to avoid possibile instrumental residuals in the signal (Mura et al., 2017). We find that on the South Pole, for -87.5°<LAT<-82.5° the variability is due to an increase of thesignal as a function of time, suggesting that the source is increasing the energy of the falling particles. At lower Latitude (-77.5°<LAT<72.5°) the variability is mainly due to a morphological evolution (migration / fragmentation) of some features, likely due to occurence of turbulence in the region of the plasma that is the source for these particles.