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- UVCS
-
- UVCS has determined that protons and the more massive oxygen and magnesium particles are hotter than the electrons
- in the outflowing coronal gas near the Sun. It has discovered remarkably broad spectral widths of oxygen and
- magnesium emissions in polar coronal holes demonstrating intense preferential heating of these ions in the region
- where the highest speed wind originates. The analysis showed anisotropic velocity distributions and very rapid
- acceleration with oxygen outflow speeds twice those of the protons. The only known explanation for this preferential
- heating and acceleration is absorption form high frequency magnetohydrodynamic waves.
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