Researchers use careful measurements of how the Sun's plasma rises and falls to detect up to a million different sound waves echoing through its gases. Sunspots rise and fall in frequency over an 11-year cycle, signalling peaks and lows in solar activity. |
http://www.noao.edu/education/ighelio/solar_music.html |
http://soi.stanford.edu/results/ |
http://soi.stanford.edu/results/sounds.html |
http://helios.tuc.noao.edu/ |