Abstract
A revised analysis of Freja observations shows that events interpreted previously as broadband turbulence in the frequency domain, f ∼1–500 Hz represent in fact turbulence of dispersive Alfvén waves (DAW) covering a wide range of wave vectors k⟂. A satellite's motion through broad Δk⟂, low frequency, ω < ωci, Alfvénic structures makes them appear as broadband waves at (Doppler) frequencies Δω = vs · Δk⟂ in the satellite reference frame. The identification is made with the measured ratio of δE/δB fluctuations which is consistent with the theoretical prediction for inertial Alfvén wave spectrum at spatial scales λ⟂ ∼30–7000 m. In addition, we demonstrate that the multipoint measurements with double density probes provide independent confirmation of the spatial nature of the low frequency fluctuations.
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