Auroral crackling sounds and Schumann resonances

Unto K. Laine*

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Observations of unusual sounds like claps, snaps, and cracklings from a serene sky under actively moving, bright aurora borealis have been reported during a long history. Since year 2000 the auroral sounds have been studied in Finland. In 2011 a sound source associated with the aurora was localized for the first time in the sky approximately 70 meters from the ground. To accommodate for the surprisingly low altitude of the source, a hypothesis that the sounds are produced by corona discharges in a temperature inversion layer at the observed altitude was published in 2016. The focus of the present paper is in the acoustic analysis of the crackling sounds that are sequences with complex temporal structures. It is shown that the sounds share similar rhythmical patterns, which are connected to the electromagnetic resonances in the atmosphere, also known as the Schumann resonances

    Original languageEnglish
    Title of host publicationProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
    PublisherCanadian Acoustical Association
    Number of pages8
    ISBN (Electronic)9781999181000
    Publication statusPublished - 7 Jul 2019
    MoE publication typeA4 Conference publication
    EventInternational Congress on Sound and Vibration - Montreal, Canada
    Duration: 7 Jul 201911 Jul 2019
    Conference number: 26

    Publication series

    NameProceedings of the International Congress on Sound and Vibration
    ISSN (Electronic)2329-3675

    Conference

    ConferenceInternational Congress on Sound and Vibration
    Abbreviated titleICSV
    Country/TerritoryCanada
    CityMontreal
    Period07/07/201911/07/2019

    Keywords

    • Auroral sounds
    • Geomagnetic storms
    • Schumann resonances

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