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Temperature inversion in the Io plasma torus.

Moncuquet, Michel; Meyer-Vernet, Nicole; Hoang, Sang

We present in situ measurements of electron parameters as a function of latitude in the Io plasma torus, deduced from an extended analysis of the radio and plasma wave data acquired on board Ulysses. We find that the density and temperature are anti-correlated and obey an approximate polytrope law T_e ∝ √{1/n_e}. We interpret t…