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Doppler Velocity determines how fast the particles are
moving and whether the particles are moving up or down. The
particles are moving down in the warm-colored areas
(red, orange), and moving up in the cool-colored areas
(blue, green). Because the doppler velocity shows us up and
down motion, we can detect things like convection or waves in
the air. In this image, the air is moving up and down due to
a gravity wave. This is similar to throwing a rock in a pond
and watching the water make ripples - gravity waves are
"ripples" in the air.
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