| The
Doppler effect reveals ripples on the surface |
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| Spectroscopic |
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| observations
show up |
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| and down
motions on |
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| the surface
with no |
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| obvious
pattern. |
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| However,
careful |
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| harmonic
analysis |
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| shows that
these |
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| motions are
organized |
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| in millions
of individual |
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| “notes”, or
modes. |
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| Four of these
modes |
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| are shown
here. |
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