Analysis of the acoustic conversion efficiency for infrasound from atmospheric entry of NEO`s

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ReVelle (1995) has recently presented a summary of available infrasonic signals from near earth objects (NEO`s) that entered the earth`s atmosphere between 1960-1980. We will analyze these signals using a formalism developed by Cox (1958) to calculate the energy of explosive sources in the atmosphere. For each source we will calculate the acoustic conversion efficiency for each source, i.e., the fraction of the original source energy that is available to couple into an acoustic wave. Based on results in Cox with conventional explosions, this quantity is expected to depend weakly on the range from the source. Since this quantity is ... continued below

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11 p.

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Whitaker, R.W. & ReVelle, D.O. February 1, 1996.

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ReVelle (1995) has recently presented a summary of available infrasonic signals from near earth objects (NEO`s) that entered the earth`s atmosphere between 1960-1980. We will analyze these signals using a formalism developed by Cox (1958) to calculate the energy of explosive sources in the atmosphere. For each source we will calculate the acoustic conversion efficiency for each source, i.e., the fraction of the original source energy that is available to couple into an acoustic wave. Based on results in Cox with conventional explosions, this quantity is expected to depend weakly on the range from the source. Since this quantity is difficult to estimate using fundamental blast wave theories, we instead use well-known, and independently calibrated, semi-empirical source energy-wave period (at maximum amplitude) scaling relations developed in the 1960-1975 period by the U.S. Air Force to determine the source energy, E{sub s}, from observations. Using E{sub s} and range to the source along with various observed signal and atmospheric properties, the efficiency can be computed, similar calculations have been done for other relevant atmospheric phenomena for low altitude sources. For example, thunder observations at relatively close range have been used by Few and co-workers to determine an acoustic conversion efficiency of about 0.4%. The only previous estimation for meteors was made by Astapovich (1946) who determined the acoustic efficiency to be less than 0.01%. By computing this efficiency factor we hope to predict the expected detection rate of large NEO`s for the proposed CTBT global scale infrasonic array systems, and to establish the rate of false alarms due to natural atmospheric explosions.

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11 p.

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OSTI as DE96005499

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  • 2. comet day conference, Santa Fe, NM (United States), Mar 1996

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  • Other: DE96005499
  • Report No.: LA-UR--95-4121
  • Report No.: CONF-9603115--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 192456
  • Archival Resource Key: ark:/67531/metadc668980

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Feb. 29, 2016, 1:06 p.m.

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Whitaker, R.W. & ReVelle, D.O. Analysis of the acoustic conversion efficiency for infrasound from atmospheric entry of NEO`s, article, February 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc668980/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.