Summary
Intensity variations of nucleonic component at Mina Aguilar (4 000 m o.s.l., 12° S geomagnetic latitude) are analyzed as a function of time, for the July 1959 storms. It is suggested that the intensity behaviour is due to a linear addition of three independent Forbush decreases of different amplitudes and relaxation times, but of approximately the same form of primary variation spectrum at high energies. The slow recovery after the third storm is mainly determined by the relaxation time of the second storm.
Riassunto
Si analizzano in funzione del tempo le variazioni di intensità della componente nucleonica a Mina Aguilar (4 000 m s.l.m., 12° S latitude geomagnetica), per le tempeste del Luglio 1959. Si suggerisce che il comportamento della intensità sia dovuto alla composizione lineare di tre indipendenti decrementi di Forbush di ampiezze e tempi di rilassamento diversi, ma aventi approssimativamente la stessa forma dello spettro di variazione della componente primaria. La lenta ripresa dopo la terza tempesta è dovuta principalmente al tempo di rilassamento della seconda tempesta.
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References
J. G. Roederer, O. R. Santochi, J. C. Anderson, J. M. Cardoso andJ. R. Manzano:Nuovo Cimento,18, 120 (1960).
Loc. cit. (1), Fig. 6.
For the definition of the constantΓ, see formula (4) of (1).
This is also true for Ellsworth neutron monitor data, although at this station the intensity fluctuations around the exponential form are much more pronounced. With respect to Buenos Aires records, it has been already mentioned in (1) that percentage variations fit within normal fluctuations with those recorded at Mina Aguilar.
P. Morrison:Phys. Rev.,101, 1397 (1956).
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Roederer, J.G., Santochi, O.R., Anderson, J.C. et al. Analysis of cosmic ray intensity time-dependence recorded at Mina Aguilar during July 1959. Nuovo Cim 18 (Suppl 1), 131–135 (1960). https://doi.org/10.1007/BF02726043
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DOI: https://doi.org/10.1007/BF02726043