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Background of gravitational-wave antennas of possible terrestrial origin.-II

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Il Nuovo Cimento C

Summary

In order to deepen the analysis of the events recorded during May 1980 by the Frascati antenna (see the previous paper), we have Fourier-analysed their times of arrival and found the following periods of free oscillation of the Earth: ℱ(0 S -12 )=55.03, ℱ(0 S -12 )=53.12, ℱ(0 S 4=25.84, ℱ(0 T 3=28.85 minutes. A similar analysis of data collected in June–July 1978 has shown the following periods: ℱ(0 S -12 )=55.23, ℱ(0 S -23 )=36.23, ℱ(0 S -23 )=35.30, ℱ(0 S 0=20.38÷20.61, ℱ(0 T 2=41.18, ℱ(0 T 4 -3=21.73, ℱ(0 T 4 +3=21.64 minutes. The probability for these periods to be accidental in all cases is very small.

Riassunto

Per approfondire l'analisi degli eventi registrati dall'antenna di Fascati nel Maggio 1980 (vedi lavoro precedente) si è applicata l'analisi di Fourier ai loro tempi di arrivo e si sono trovati i seguenti periodi di oscillazione libera della Terra: ℱ(0 S -12 )=55.03, ℱ(0 S -12 )=53.12, ℱ(0 S 4=25.84, ℱ(0 T 3=28.85 minuti. Una simile analisi dei dati registrati nel periodo Giugno-Luglio 1978 ha mostrato i seguenti periodi: ℱ(0 S -12 )=55.23, ℱ(0 S -23 )=36.23, ℱ(0 S -23 )=35.30, ℱ(0 S 0=20.38÷20.61, ℱ(0 T 2=41.18, ℱ(0 T 4 -3=21.73, ℱ(0 T 4 +3=21.64 minuti. La probabilità che questi periodi siano accidentali è molto piccola in tutti i casi.

Резюме

Для того, чтобы углубить анализ событий, зарегистрированных в течение Мая 1980 года с помощью антенны во Фраскати (см. предыдущую статью), мы поводим Фурье-анализ времен прибытия сигналов. Получаются следующие гериоды свободных осцилляций Земли: ℱ(0 S -12 )=55.03, ℱ(0 S -12 )=53.12, ℱ(0 S 4=25.84, ℱ(0 T 3=28.85 минут. Аналогичный анализ данных, собранных в июне-июле 1978 года, показывает следующие периоды ℱ(0 S -12 )=55.23, ℱ(0 S -23 )=36.23, ℱ(0 S -23 )=35.30, ℱ(0 S 0=20.38÷20.61, ℱ(0 T 2=41.18, ℱ(0 T 4 -3=21.73, ℱ(0 T 4 +3=21.64 минут. Вероятность того, что эти периоды являются случайными, во всех случаях оказывается очень малой.

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Authors and Affiliations

  1. Istituto di Fisica dell'Università, Roma, Italia

    E. Amaldi, S. Frasca, G. V. Pallottino & G. Pizzella

  2. Sezione di Roma, Istituto Nazionale di Fisica Nucleare, Italia

    E. Amaldi, S. Frasca, G. V. Pallottino, G. Pizzella & P. Bonifazi

  3. Istituto Plasma nello Spazio del C.N.R., Frascati, Italia

    G. V. Pallottino, G. Pizzella & P. Bonifazi

Authors
  1. E. Amaldi
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  2. S. Frasca
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  3. G. V. Pallottino
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  4. G. Pizzella
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  5. P. Bonifazi
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Additional information

The main points of this paper have been presented byG. Pizzella at the Workshop on Gravitational Radiation Detectors of the Tenth Texas Symposium on Relativistic Astrophysics, held in Baltimore, Md., December 15–19, 1980.

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Amaldi, E., Frasca, S., Pallottino, G.V. et al. Background of gravitational-wave antennas of possible terrestrial origin.-II. Il Nuovo Cimento C 4, 309–323 (1981). https://doi.org/10.1007/BF02574723

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  • DOI: https://doi.org/10.1007/BF02574723

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