Learning about coronal heating from solar wind observations

Details Learning about coronal heating from solar wind observations Learning about coronal heating from solar wind observations

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phpl...12e6501g&link_type=abstract

Physics of Plasmas, Volume 12, Issue 5, pp. 056501-056501-5 (2005).

Physics

7

Plasma Heating By Radio-Frequency Fields, Icr, Icp, Helicons, Particle Measurements, Magnetohydrodynamic Waves, Fluctuation And Chaos Phenomena, Transport Properties, Particle Emission, Solar Wind

Scientific paper

Vlasov theory describing the interaction of Alfvén-cyclotron fluctuations and ions in the collisionless solar wind predicts that alpha particles should be strongly scattered perpendicular to the background magnetic field when the alpha/proton relative velocity vαp is negative or has a sufficiently small positive value relative to the Alfvén speed vA. This theory also predicts that, if vαp/vA is positive and sufficiently large, it is the protons which are scattered in the perpendicular direction, although less strongly. Here proton and alpha particle anisotropies measured in the solar wind near 1 AU (AU, astronomical unit) by the plasma and magnetic field instruments on the Advanced Composition Explorer spacecraft are reported which are consistent with these predicted signatures. This indicates that Alfvén-cyclotron heating of ions is active in the solar wind; by using this medium to study this fundamental process, a greater understanding may be obtained of how Alfvén-cyclotron scattering contributes to heating of ions in the solar corona.

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