Astronomy Picture of the Day . ... 15.06.1999 . ... One mode of Solar oscillation is depicted graphically above , with blue indicating outward motion, and red indicating inward motion. ... In helioseismology , these oscillations are being analyzed and are revealing unprecedented information about the density, temperature, motion , and chemical composition of the entire Sun . ... June 1999 . ... Publications with keywords: Sun - oscillations . Publications with words: Sun - oscillations . ...