Systematic Measurements of Ion-Proton Differential Streaming in the Solar Wind

Details Systematic Measurements of Ion-Proton Differential Streaming in the Solar Wind Systematic Measurements of Ion-Proton Differential Streaming in the Solar Wind

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.106o1103b&link_type=abstract

Physical Review Letters, vol. 106, Issue 15, id. 151103

Physics

Solar Wind Plasma, Sources Of Solar Wind, Magnetohydrodynamic Waves

Scientific paper

The small amount of heavy ions in the highly rarefied solar wind are sensitive tracers for plasma-physics processes, which are usually not accessible in the laboratory. We have analyzed differential streaming between heavy ions and protons in the solar wind at 1 AU. 3D velocity vector and magnetic field measurements from the Solar Wind Electron Proton Alpha Monitor and the Magnetometer aboard the Advanced Composition Explorer were used to reconstruct the ion-proton difference vector vip=vi-vp from the 12 min 1D Solar Wind Ion Composition Spectrometer observations. We find that all 44 analyzed heavy ions flow along the interplanetary magnetic field at velocities which are smaller than, but comparable to, the local Alfvén speed CA. The flow speeds of 35 of the 44 ion species lie within the range of ±0.15CA around 0.55CA, the flow speed of He2+.

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