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Pregled bibliografske jedinice broj: 81949

Časopis

Autori: Zgrablić, Goran; Vinković, Dejan; Gradečak, Silvija; Kovačić, Damir; Biliškov, Nikola; Grbac, Neven; Andreić, Željko; Garaj, Slaven
Naslov: Instrumental recording of electrophonic sounds from Leonid fireballs
Izvornik: Journal of Geophysical Research-Space Physics (0148-0227) 107 (A7) (2002); 1124-1132
Vrsta rada: članak
Ključne riječi: electrophonic sounds; Leonids
Sažetak:
Electrophonic meteor sounds, heard simultaneously with the meteor appearance, are longstanding problem due to their non-intuitive 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 special set-up and heard by different observers. Simultaneous measurements of electromagnetic radiation above 500 Hz did not reveal any signal correlated to the electronic event. The lack of signal was explained by 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.
Projekt / tema: 0098021
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
SCI-EXP, SSCI i/ili A&HCI
Current Contents Connect (CCC)
Scopus
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL cjelovitog teksta:
Google Scholar: Instrumental recording of electrophonic sounds from Leonid fireballs



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