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Detailed Reference Information |
Stasiewicz, K., Khotyaintsev, Y., Berthomier, M. and Wahlund, J.-E. (2000). Identification of widespread turbulence of dispersive Alfvén waves. Geophysical Research Letters 27: doi: 10.1029/1999GL010696. issn: 0094-8276. |
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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 Alfv¿n waves (DAW) covering a wide range of wave vectors k⊥. A satellite's motion through broad Δk⊥, low frequency, &ohgr;<&ohgr;ci, Alfv¿nic structures makes them appear as broadband waves at (Doppler) frequencies Δ&ohgr;=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 Alfv¿n wave spectrum at spatial scales &lgr;⊥~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. ¿ 2000 American Geophysical Union |
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Abstract |
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Keywords
Magnetospheric Physics, Plasma waves and instabilities, Space Plasma Physics, Turbulence |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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