Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3450e&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The cosmic-ray ground level enhancement on 29 September 1989 is the largest relativistic solar proton event since 1956's. Four representative pairs of neutron detector have been selected to compute the mean attenuation length for the solar protons (λS) produced in the considered event, over a wide range of particle rigidities. Each pair of detectors has a very similar of geomagnetic vertical cut-off rigidity and differs in terms of the altitude of the observing site. The computed values of λS have shown a strong correlation with the vertical geomagnetic cut-off rigidity for the observing site. Furthermore, we have studied the power spectra for the event. The time of the first maximum is dominated by the higher rigidity particles, while the lower rigidity flux reaches its maximum at the time of the second peak. In addition, at the time of the first maximum the spectrum of the event was hard and it soften throughout the remainder of the event.
Al-Thoyaib Suleiman S.
El-Borie M. A.
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