Whistler mode turbulence in the disturbed solar wind

Magnetic field fluctuations with frequencies f between the ion ( f/sub c/i) and electron ( f/sub c/e) cyclotron frequencies are enhanced downstream of interplanetary shocks and in fast streams. These f>f/sub c/i fluctuations are related to those below f/sub c/i that also accompany solar wind activity. The spectra over the range 10/sup -2/ f/sub c/i < or =f< or approx. = f/sub c/e synthesized from ISEE3 magnetometer and plasma wave instrument data can generally be described by one power law below froughly-equal1 Hzroughly-equalf/sub c/i and a different one above. However, behind four shocks the spectral index above f/sub c/i was measured to be about twice that below f/sub c/i, whereas no clear relationship is apparent in the weaker fast stream events. Behind one shock the interference in the low-frequency electric field channels of the ISEE3 plasma wave instrument was small enough to permit a statistical study of the B/E ratios or, equivalently, the indices of refraction, of the f/sub c/i < or =f< or =f/sub c/e waves. Although the data base is limited, the B/E ratios confirm that the waves are whistler mode emissions, as their frequency range already suggested. Various indirect lines of evidence indicate that these whistler wavesmore » are generated propagating at large angles to the local interplanetary field, a fact that helps identify possible free energy sources for their growth.« less

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