Whistler mode waves are suggested to play a dual role in precipitation loss and acceleration of energetic electrons in Jovian magnetosphere. Using the combined wave data from Juno and Galileo, we constructed global maps of whistler mode waves in the Jovian inner magnetosphere (M‐shell <20). Whistler mode waves are found to be extensively present over M‐shells from 6 to ~13, peaking at ~10, and extend to magnetic latitudes at least up to 50°. Whistler mode wave intensities vary from a few pT to ~100 pT, similar to the intensity level at Earth. The new finding on the latitudinal extension of whistler mode waves indicates their potential effects on electron precipitation over a broad energy range from ~100 eV to several MeV. The newly constructed whistler mode wave spectra are crucial for evaluating the accurate role of whistler mode waves in energetic electron dynamics in the Jovian inner magnetosphere.
Plain Language Summary
Whistler mode waves, a type of natural plasma wave with frequencies below electron cyclotron frequency, are known to play an important role in both loss and acceleration processes of energetic electrons in Jovian magnetosphere. However, the global distribution of whistler mode waves in an extensive region, which is critical for evaluating the effects of whistler mode waves on energetic electrons, is not well known. In the present study, we constructed global maps of whistler mode waves in the Jovian inner magnetosphere using plasma wave data from both Juno and Galileo satellites. Our statistical results show that whistler mode waves are extensively present with an intensity ranging from a few picotesla (pT) to ~100 pT, similar to the intensity level at Earth. In particular, Juno wave data newly reveal that whistler mode waves can extend to magnetic latitudes at least up to 50°, implying that whistler mode waves should be effective in scattering electrons into the upper atmosphere over a broad energy range from ~100 electronvolts to several mega‐electronvolts. Whistler mode wave spectra from Juno also provide crucial information for quantifying the role of whistler mode waves in energetic electron dynamics in the Jovian inner magnetosphere.
Whistler mode waves are extensively present in the Jovian inner magnetosphere peaking at M‐shell ~10
Whistler mode waves are observed at magnetic latitudes up to at least ~50°, higher than previously thought
Whistler mode wave distributions from Juno and Galileo are consistent in the overlapped region with an intensity up to ~100 pT