Sounding the Sun's Chromosphere
Duvall, T. L., Jr.; Shibahashi, H.; Jefferies, S. M.; Harvey, J. W.; Osaki, Y.; D'Silva, S.
United States, Japan
Abstract
Time-distance analysis of solar acoustic waves with frequencies above the nominal atmospheric acoustic cutoff frequency (~5.3 mHz) shows partial reflection of the waves at both the Sun's photosphere and a layer located higher in the atmosphere. This result supports recent reports of chromospheric modes.