STEREO Observations of Large Amplitude, Low Frequency Waves in the Solar Wind

Details STEREO Observations of Large Amplitude, Low Frequency Waves in the Solar Wind STEREO Observations of Large Amplitude, Low Frequency Waves in the Solar Wind

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41a..22k&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41A-22

Physics

2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

We describe results of a statistical survey of large amplitude, low frequency waves observed by the STEREO WAVES TDS instrument. The S/WAVES TDS is a new tool for understanding wave/particle interactions, providing 3d electric field waveforms, triggered on large amplitudes. This study focuses on waves in the intermediate range (between ~10 Hz and several kHz), from above the ion cyclotron frequency to the electron cyclotron frequency and the ion plasma frequency, including kinetic Alfven waves, whistlers, lower hybrid waves, ion acoustic waves and time domain structures such as solitary waves (electron holes). Theoretical and observational studies suggest that this frequency range is critical to understanding the evolution of the solar wind, specifically the pitch angle width of strahl, regulation of heat flux, and the halo and super-halo components. Initial observations have revealed waves in the 10s of Hz range (the band usually attributed to whistlers that could regulate heat flux and broaden strahl) that are 1 to 2 orders of magnitude larger than previously reported. Statistical results on wave modes and amplitudes will be presented and compared to theoretical models of the evolution of solar wind electron distributions.

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