Wind Observations of Whistler Waves in the Solar Wind at 1 AU and Their Role on the Regulation of the Electron Heat Flux.

Details Wind Observations of Whistler Waves in the Solar Wind at 1 AU and Their Role on the Regulation of the Electron Heat Flux. Wind Observations of Whistler Waves in the Solar Wind at 1 AU and Their Role on the Regulation of the Electron Heat Flux.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0121s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0121

Physics

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 7859 Transport Processes, 7867 Wave/Particle Interactions, 7871 Waves And Instabilities

Scientific paper

A weak but persistent level of electromagnetic noise with frequencies between the ion (fci ˜ 0.08 Hz) and the electron (fce ˜ 150 Hz) cyclotron frequencies has been observed in the ambient solar wind for more than 25 years. It is commonly believed that these fluctuations are due to whistler mode emissions, as their frequency range suggests. Yet, the origin and the properties of that ``background level" of waves and its role in the electron heat flux regulation in the solar wind at 1 AU is still poorly understood. We present observations from the WAVES experiment on WIND, near L1 during 50 days close to the last minimum of solar activity, using the FFT (Fast Fourier Transform) spectral receivers and the TDS (Time Domain Sampler) waveform analyzer. Magnetic spectra and waveforms observed between fci and fce are used to determine the properties of the waves. We analyze also the electron heat flux measured by the 3D-Plasma experiment, in relation to the background level of magnetic fluctuations. First, the nature of the wave mode is discussed: are they effectively whistler waves or, for example, kinetic Alfvén waves? Then, we show that these waves are likely to play a role in the regulation of the heat flux in the solar wind. According to recent theories, whistler waves reduce the intensity of the heat flux through wave-particle scattering associated with a heat flux instability. The possible source(s) of the waves are finally discussed : are they the result of a heat flux instability or the result of an existent nonlinear cascade of Alfvénic-like fluctuations?

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