Alpha Particle Heating in the Solar Wind: ACE Observations

Details Alpha Particle Heating in the Solar Wind: ACE Observations Alpha Particle Heating in the Solar Wind: ACE Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51c0278g&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH51C-0278

Physics

7867 Wave/Particle Interactions, 2149 Mhd Waves And Turbulence, 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

Alfvén-cyclotron fluctuations of successively shorter wavelengths in collisionless plasmas transfer energy via cyclotron resonances to ions of successively larger charge-to-mass ratios. Theories and simulations predict that this interaction leads to T⊥}/T{∥ > 1 for each resonant ion species, where the subscripts refer to directions relative to the background magnetic field. Here observations of the solar wind near 1 AU by the plasma and magnetic field instruments on the ACE spacecraft are reported which show the predicted signatures of such wave-ion interactions in the proton and alpha particle anisotropies. These results support the theory that Alfvén-cyclotron fluctuations are an important source of heavy ion heating in the corona.

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