Il Nuovo Cimento A (1965-1970)

, Volume 40, Issue 2, pp 476–485 | Cite as

Day-to-day changes in the energy spectrum of the daily variation of cosmic-ray intensity

  • R. P. Kane


Day-to-day changes in the ratios of amplitudes and differences between the hours of maxima of the first harmonics of the daily variations of the nucleonic component at middle latitudes and at the equator are studied for the I.G.Y. period. It is concluded that apart from the unique sources of daily variation outside geomagnetic influence and local sources within the geomagnetic field, other sources effective predominantly at middle latitudes only or at equatorial stations only seem to exist for the first harmonic. The average second harmonic seems to be a predominantly equatorial phenomenon due to either a local source or alternatively a source in directions about 120° W or 60° E of the Earth-Sun line and most probably unconnected with the first harmonic.


Local Source Daily Variation Equatorial Station Amplitude Ratio Middle Latitude 
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Si studiano le variazioni giornaliere dei rapporti delle ampiezze e delle differenze delle ore di massimo della prima armonica delle variazioni giornaliere della componente nucleonica alle latitudini medie ed all'equatore durante il periodo dell'A.G.I. Se ne conclude che, a parte le uniche sorgenti di variazione giornaliera esterne all'influenza geomagnetico, sembra che esistano per la prima armonica altre sorgenti efficaci principalmente alle medie latitudini soltanto o soltanto alle stazioni equatoriali. Sembra che la seconda armonica media sia un fenomeno principalmente equatoriale dovuto o a una sorgente locale o, in alternativa, ad una sorgente in direzione a 120° W o 60° E rispetto alla linea terra-sole e molto probabilmente non connessa con la prima armonica.


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Copyright information

© Società Italiana di Fisica 1965

Authors and Affiliations

  • R. P. Kane
    • 1
  1. 1.Physical Research LaboratoryAhmedabadIndia

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