Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1303m&link_type=abstract
American Astronomical Society, SPD meeting #40, #13.03; Bulletin of the American Astronomical Society, Vol. 41, p.832
Astronomy and Astrophysics
Astronomy
Scientific paper
We review the properties of the Alfvenic waves that were discovered with Hinode/SOT and that have been shown to permeate the upper chromosphere. Statistical analysis shows that, if they penetrate into the corona, these waves carry enough energy to impact the energy balance of the solar wind and quiet Sun corona. However, CoMP observations of Alfven waves show much smaller resolved amplitudes than would be expected from the leakage of chromospheric waves into the corona. We use Monte Carlo simulations to show that line-of-sight superposition of a mix of Alfvenic waves with properties similar to those observed with Hinode/SOT and CoMP can reproduce the low wave amplitudes and enhanced non-thermal line broadening observed with CoMP. Our analysis indicates that the CoMP observations are compatible with a scenario in which low-frequency Alfvenic waves are responsible for a large fraction of the non-thermal broadening seen in the corona although some portion remains from the power spectrum of the wave generation process. This suggests that the flux carried by Alfvenic waves, in the finely structured corona, is significant enough to impact the energy balance of the corona and solar wind.
de Pontieu Bart
McIntosh Scott W.
Tomczyk Steve
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