Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..449m&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
Waves at all scales ranging in wavelength from the size of a loop (fraction of a solar radius) down to the gyroradii (a few meters) of coronal ions are believed to play a key role in the transport of mechanical energy from the chromosphere to the Sun's corona and wind and through the dissipation of wave energy in the heating and sustaining of the solar corona. A concise review of new observations and theories of waves in the magnetically confined (loops) as well as open (holes) corona is given with emphasis on energetics and dynamics. Recent remote-sensing solar observations have revealed loop oscillations as expected from MHD theory. These low-frequency oscillations are excited in connection with flares and appear to be strongly damped. Recent analysis of in-situ measurements of ions in fast solar wind and related theory have indicated the importance of pitch-angle scattering of ions in the wave frame as predicted from kinetic plasma theory a microprocess that may hold the key to understand plasma acceleration and heating by damping of high-frequency waves. Evidence obtained from spectroscopy of coronal ions points to cyclotron resonance absorption as a possible cause of the observed emission-line broadenings.
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