Summary
The cosmic-ray intensity modulation observed at the boundary crossing of the interplanetary magnetic-field sector structure is related with the about 13 day oscillation during the years 1973 and 1974 when the magnetic field presents two sectors.
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Filisetti, O., Lovera, G. & Mussino, V. Cosmic-ray 13 day oscillation and two-sector interplanetary magnetic field. Lett. Nuovo Cimento 35, 327–330 (1982). https://doi.org/10.1007/BF02754699
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DOI: https://doi.org/10.1007/BF02754699