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Colors of meteors The color of many Leonids is caused by light emitted from metal atoms from the meteoroid (blue, green, and yellow) and light emitted by atoms and molecules of the air (red). The metal atoms emit light much like in our sodium discharge lamps: sodium (Na) atoms give an orange-yellow light, iron (Fe) atoms a yellow light, magnesium (Mg) a blue-green light, ionized calcium (Ca+) atoms may add a violet hue, while molecules of atmospheric nitrogen (N2) and oxygen atoms (O) give a red light. The meteor color depends on whether the metal atom emissions or the air plasma emissions dominate.
Why do they have different colors? Meteor showers can produce different colors of light. The difference in the color of light is caused by the different chemical make ups of meteors being vaporized. Sodium particles can produce orange/yellow light, iron will produce yellow, magnesium creates bluish/green, calcium makes violet and silicate meteors produce fiery red colors.
For example, sodium produces a bright yellow color, nickel shows as green, and magnesium as blue-white.
...Even less common though, are the occasions when witnesses are able to actually hear audible sounds associated with the falling meteor. These have been described in many various ways such as: whistling, popping, booming, thunderous, whizzing, whirling, whirring, crackling, drumming, rumbling, humming, roaring and more...Source