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Context. Observing Jupiter's synchrotron emission from the Earth remainstoday the sole method to scrutinize the distribution and dynamical behavior ofthe ultra energetic electrons magnetically trapped around the planet (becausein-situ particle data are limited in the inner magnetosphere). Aims. We performthe first resolved and low-frequency imaging of the synchrotron emission withLOFAR at 127 MHz. The radiation comes from low energy electrons (~1-30 MeV)which map a broad region of Jupiter's inner magnetosphere. Methods (see articlefor complete abstract) Results. The first resolved images of Jupiter'sradiation belts at 127-172 MHz are obtained along with total integrated fluxdensities. They are compared with previous observations at higher frequenciesand show a larger extent of the synchrotron emission source (>=4 $R_J$). Theasymmetry and the dynamic of east-west emission peaks are measured and thepresence of a hot spot at lambda_III=230 {\deg} $\pm$ 25 {\deg}. Spectral fluxdensity measurements are on the low side of previous (unresolved) ones,suggesting a low-frequency turnover and/or time variations of the emissionspectrum. Conclusions. LOFAR is a powerful and flexible planetary imager. Theobservations at 127 MHz depict an extended emission up to ~4-5 planetary radii.The similarities with high frequency results reinforce the conclusion that: i)the magnetic field morphology primarily shapes the brightness distribution ofthe emission and ii) the radiating electrons are likely radially andlatitudinally distributed inside about 2 $R_J$. Nonetheless, the larger extentof the brightness combined with the overall lower flux density, yields newinformation on Jupiter's electron distribution, that may shed light on theorigin and mode of transport of these particles.

Imaging Jupiter's radiation belts down to 127 MHz with LOFAR