Anomalous Sounds from the Entry of Meteor Fireballs

A very bright fireball observed over New South Wales in 1978 produced anomalous sounds clearly audible to some of the observers. An investigation of the phenomenon indicates that bright fireballs radiate considerable electromagnetic energy in the very-low-frequency (VLF) region of the spectrum. A me...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1980-10, Vol.210 (4465), p.11-15
1. Verfasser:	Keay, C S
Format:	Artikel
Sprache:	eng
Schlagworte:	Auditory perception Electromagnetic radiation Electromagnetic spectrum Fireballs Flame spectroscopy Magnetic fields Meteors Nature sounds Observations Radio Radio spectrum Sound
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creator	Keay, C S
description	A very bright fireball observed over New South Wales in 1978 produced anomalous sounds clearly audible to some of the observers. An investigation of the phenomenon indicates that bright fireballs radiate considerable electromagnetic energy in the very-low-frequency (VLF) region of the spectrum. A mechanism for the production of VLF emissions from the highly energetic wake turbulence of the fireball is proposed. Trials with human subjects revealed a very extended range of thresholds for the perception of electrically excited sounds among a sample population, particularly when the VLF electric field excites surface acoustic waves in surrounding objects. This fact, together with variable propagation effects and local conditions, can account for the sporadic distribution of reports of anomalous sounds from fireballs and auroras.
doi_str_mv	10.1126/science.210.4465.11
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An investigation of the phenomenon indicates that bright fireballs radiate considerable electromagnetic energy in the very-low-frequency (VLF) region of the spectrum. A mechanism for the production of VLF emissions from the highly energetic wake turbulence of the fireball is proposed. Trials with human subjects revealed a very extended range of thresholds for the perception of electrically excited sounds among a sample population, particularly when the VLF electric field excites surface acoustic waves in surrounding objects. 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This fact, together with variable propagation effects and local conditions, can account for the sporadic distribution of reports of anomalous sounds from fireballs and auroras.</description><subject>Auditory perception</subject><subject>Electromagnetic radiation</subject><subject>Electromagnetic spectrum</subject><subject>Fireballs</subject><subject>Flame spectroscopy</subject><subject>Magnetic fields</subject><subject>Meteors</subject><subject>Nature sounds</subject><subject>Observations</subject><subject>Radio</subject><subject>Radio spectrum</subject><subject>Sound</subject><issn>0036-8075</issn><issn>1095-9203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1980</creationdate><recordtype>article</recordtype><recordid>eNp9kU9LxDAQxYMouv75BIr0pAepTpq0aY7LsquCsgf1HJp0opW00aQL-u3NugvePA28-c3jMY-QUwrXlBbVTTQdDgaviyRwXpVJ3SETCrLMZQFsl0wAWJXXIMoDchjjO0DaSbZPDqgQZfIQE8Kmg-8b51cxe_KroY2ZDb7PxjfM5sMYvjNvs0cc0Yds0QXUjXPxmOzZxkU82c4j8rKYP8_u8ofl7f1s-pAbTuWYl5pTbQzXFqCqGbUlWIaWm7atOGgQaKApwKLW1NaIlIq2sRq1RKFrTtkRudz4fgT_ucI4qr6LBp1rBkyBlWCM1rISa_LiX7JgQvJKygRebcDXxqHqBuOHEb9G453DV1Qp_mypplRALX9t2YY2wccY0KqP0PVN-FYU1LoDte1ApQ7UuoOkpqvzbZiV7rH9u9k-PQFnG-A9jj787aual0KyHzm1jKc</recordid><startdate>19801003</startdate><enddate>19801003</enddate><creator>Keay, C S</creator><general>The American Association for the Advancement of Science</general><general>American Association for the Advancement of Science</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope></search><sort><creationdate>19801003</creationdate><title>Anomalous Sounds from the Entry of Meteor Fireballs</title><author>Keay, C S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c419t-5b41bcc4bf006831f50f3ef4cdd640b07ec0a20febb1f8ee117dafbeb9e7b8413</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1980</creationdate><topic>Auditory perception</topic><topic>Electromagnetic radiation</topic><topic>Electromagnetic spectrum</topic><topic>Fireballs</topic><topic>Flame spectroscopy</topic><topic>Magnetic fields</topic><topic>Meteors</topic><topic>Nature sounds</topic><topic>Observations</topic><topic>Radio</topic><topic>Radio spectrum</topic><topic>Sound</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Keay, C S</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Science (American Association for the Advancement of Science)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Keay, C S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Anomalous Sounds from the Entry of Meteor Fireballs</atitle><jtitle>Science (American Association for the Advancement of Science)</jtitle><addtitle>Science</addtitle><date>1980-10-03</date><risdate>1980</risdate><volume>210</volume><issue>4465</issue><spage>11</spage><epage>15</epage><pages>11-15</pages><issn>0036-8075</issn><eissn>1095-9203</eissn><abstract>A very bright fireball observed over New South Wales in 1978 produced anomalous sounds clearly audible to some of the observers. 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source	American Association for the Advancement of Science; Jstor Complete Legacy
subjects	Auditory perception Electromagnetic radiation Electromagnetic spectrum Fireballs Flame spectroscopy Magnetic fields Meteors Nature sounds Observations Radio Radio spectrum Sound
title	Anomalous Sounds from the Entry of Meteor Fireballs
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