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The heavy component of the primary cosmic radiation during solar maximum

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Il Nuovo Cimento (1955-1965)

Summary

The heavy component of the primary cosmic radiation was studied at geomagnetic latitude 55° N at a time of solar maximum. The total flux was found to be down by a factor of about two, compared to the results obtained during solar minimum, but the charge spectrum was found to be the same, to within experimental errors. The extrapolated fluxes at the top of the atmosphere were found to be: (3.08±0.64) part./m2 sr s for 3⩽Z⩽5; (8.26±0.82) part./m2 sr s for 6⩽Z⩽9; and (2.96±0.49) part./m2 sr s for 10⩽Z. When this work was combined with that of other experimentalists obtained at different latitudes and compared to the data obtained at solar minimum, the change in the integral spectrum was found to be in fair agreement with the predictions of an electric deceleration modulating mechanism.

Riassunto

Abbiamo studiato la componente pesante della radiazione cosmica primaria alla latitudine geomagnetica 55° N all’epoca del massimo solare. Abbiamo trovato che il flusso totale era diminuito per un fattore di circa due rispetto ai risultati ottenuti durante il minimo, ma lo spettro delle cariche era lo stesso entro i limiti degli errori sperimentali. Abbiamo trovato che i flussi, estrapolati alla sommità dell’atmosfera, sono: (3.08±0.64) part./m2 sr r per 3⩽Z⩽5; (8.26±0.82) part./m2 sr s per 6⩽Z⩽9, e (2.96±0.49) part./m2 sr s per 10⩽Z. Dopo aver combinato i dati di questo lavoro con quelli di altri sperimentatori, ottenuti a latitudini diverse, ed averli confrontati con i dati ottenuti al minimo solare, abbiamo trovato che la variazione dello spettro integrale era in buon accordo con le predizioni di un meccanismo elettrico di modulazione della decelerazione.

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Author notes

  1. C. E. Fichtel

    Present address: Goddard Space Flight Centre, N.A.S.A., Washington, D.C.

Authors and Affiliations

  1. Department of Physics, Washington University, St. Louis, Mo.

    C. E. Fichtel

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  1. C. E. Fichtel
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Additional information

The work reported here has been supported by the Air Force Office of Scientific Research, the Office of Ordnance Research and the National Science Foundation.

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Fichtel, C.E. The heavy component of the primary cosmic radiation during solar maximum. Nuovo Cim 19, 1100–1115 (1961). https://doi.org/10.1007/BF02731386

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  • DOI: https://doi.org/10.1007/BF02731386

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