Abstract:<p>During twilight, when the sun is below the horizon, clouds and atmospheric dust can still be illuminated by the sun if they are high enough over the surface, as they escape the shadow of the planet. Observations of this direct illumination can be used to determine the minimum altitude for elevated features. While this is a rare phenomenon on Earth, it is a common occurrence on Mars, where clouds and aerosols can usually reach high altitudes in the mesosphere. Twilight clouds were first observe… Show more
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