A large amplitude oscillation in the vertical column abundance of atmospheric OH has been observed in ground‐based spectroscopic absorption measurements from Fritz Peak Observatory, Colorado (105°W, 40°N) during and after the partial solar eclipse of May 30, 1984. An initial OH reduction during the eclipse was followed by an underdamped oscillation having a period of about one hour; the OH abundances returned to normal values two hours after the eclipse termination. This is believed to be the first observation of a "ringing" response of any atmospheric constituent to a solar ecli
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