Further Use of Natural Infrasound as a Continuous Monitor of the Upper Atmosphere

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  • 1 Lamont-Doherty Geological Observatory of Columbia University, Palisades, N. Y. 10964
  • 2 Lamont-Doherty Geological Observatory of Columbia University and The City College of the City University of New York, New York, N. Y. 10031
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Abstract

This is a further study of the use of natural infrasound in the atmosphere to monitor tidal circulation in the lower thermosphere. The height of this circulation is determined with the use of a reference atmospheric model, which is then used to calibrate infrasound/microseism ratios in terms of height. Also, we show from continuous observation over six years at 41°N, 74°W that the winter semidiurnal tide is present at least 62% of the time and the diurnal, at least 42% of the time.

Abstract

This is a further study of the use of natural infrasound in the atmosphere to monitor tidal circulation in the lower thermosphere. The height of this circulation is determined with the use of a reference atmospheric model, which is then used to calibrate infrasound/microseism ratios in terms of height. Also, we show from continuous observation over six years at 41°N, 74°W that the winter semidiurnal tide is present at least 62% of the time and the diurnal, at least 42% of the time.

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