ocr: UVCS UVCS has determined that protons and the more massive oxygen and magnesium particles are hotter than the electrons in the out- flowing coronal gas near the Sun. It has discovered remarkably broad spectral widths of oxygen and magnesium emissions in po- lar 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 rap- id acceleration with oxygen outflow speeds twice those of the pro- tons. The only known explanation for this preterential heating and accelerat ...
