CompuServe Messages

Hi, Doug. >> I remember that one particular ionization state of oxygen is responsible for the green spectral line prominent in many planetary nebulae… According to the Encyclopedia Britannica (major ref. under "Solar System"), oxygen causes the green color in meteor trails. When it occurs, the meteor is at a height ranging from 100 to 115 km, and the trail lasts from one to two seconds. The article mentions that the same green radiation is characteristic of most aurorae. — Rob