Instrumental recording of electrophonic sounds from Leonid fireballs

Details Instrumental recording of electrophonic sounds from Leonid fireballs Instrumental recording of electrophonic sounds from Leonid fireballs

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1124z&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A7, pp. SIA 11-1, CiteID 1124, DOI 10.1029/2001JA000310

Physics

2

Planetology: Solar System Objects: Meteors, Ionosphere: Ionospheric Disturbances, Radio Science: Ionospheric Physics (2409), Ionosphere: Electric Fields (2712)

Scientific paper

Electrophonic meteor sounds, heard simultaneously with the meteor appearance, are a longstanding problem due to their nonintuitive nature. Previous investigations have been undermined by lack of instrumental recordings. Here we present the first instrumental detection of electrophonic sounds obtained during the observation of 1998 Leonids from Mongolia. Two Leonid fireballs of brightness -6.5m and -12m produced short, low-frequency sounds, which were simultaneously recorded by microphones in a special setup and heard by different observers. Simultaneous measurements of electromagnetic ELF/VLF radiation above 500 Hz did not reveal any signal correlated to the electrophonic event. The lack of signal was explained by the low frequency of electrophones. We show that physical characteristics of Leonid electrophones cannot be completely explained by existing theories and that further theoretical refinement and observational work is needed. Finally, we tentatively suggest the possibility of stronger than expected coupling of fireballs with atmospheric charge dynamics and ionosphere.

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