Letter | Published:

Geomagnetic Variations observed at Maddalena Island, Sardinia

Naturevolume 214pages477478 (1967) | Download Citation



CONTINUOUS observations of the three components of the geomagnetic field were carried out at Maddalena Island (9° 24′ E., 41° 13′ N.), the northernmost part of Sardinia, facing the Bonifacio Straits, during the period 1958–1964 by the Hydrographic Institute of the Italian Navy (see Fig. 1). The declination at Maddalena Island was about 3.5° W. in 1959. Here we report preliminary analyses of the geomagnetic variations of short periods (a few minutes–3 h) observed at this observatory; brief summaries of the diurnal variations and the K-indices have already been published1.

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  1. 1

    Giorgi, M., Sull'Osservatorio Magnetico Sperimentale dell'Isola di La Maddalena, Istituto Idrografico della Marina (Genova, 1960).

  2. 2

    Yokoyama, I., J. Fac. Sci., Hokkaido Univ., 1, 331 (1961); ibid., 393 (1962).

  3. 3

    Parkinson, W. D., Geophys. J., 2, 1 (1959).

  4. 4

    Rikitake, T., and Yokoyama, I., Bull. Earthq. Res. Inst., Tokyo Univ. 33, 297 (1955).

  5. 5

    Fontaine, M., Borgne, E. Le, Mouël, J. Le, and Plessard, C., C. R. Acad. Sci. Paris, 258, 1586 (1964).

  6. 6

    Ashour, A. A., and Chapman, S., Geophys. J., 10, 31 (1965).

  7. 7

    Barber, N. F., Geophys. Supp., Mon. Not. Roy. Astro. Soc., 5, 258 (1948).

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    Present address: Geophysical Institute, Hokkaido University Sapporo Japan,


  1. Centro Nazionale per la Fisica della Atmosfera e la Meteorologia, Rome

    • M. GIORGI
    •  & I. YOKOYAMA


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