Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3104s&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
1
Scientific paper
Observations of 9 Solar Energetic Particle events detected by the instrument NINA from November 1998 to April 1999 will be presented. NINA is a silicon-based space detector in orbit since July 1998 on board the Russian satellite Resurs-01-N4, which flies at low altitude (about 800 km) in polar inclination. For every SEP event we reconstructed the power-law 4 He spectrum in the energy interval 10-50 MeV/n, extracting spectral indexes from 1.8 to 6.8. Data of 3 He and 4 He were then employed to determine the 3 He/4 He ratio, that turned out to be high for some SEP events showing the enrichment in 3 He. For the 7 November 1998 event this ratio reached the maximum value of 0.33 ± 0.06, with spectral indexes 2.5 ± 0.6 and 3.7 ± 0.3 for 3 He and 4 He, respectively. The 3 He/4 He ratio averaged over the remaining events was 0.011 ± 0.004. For all events we determined the deuterium-to-proton ratio. The average value of the 2 H/1 H ratio, over all events, was (3.9±1.4)× 10-5 in the energy interval 9-12 MeV/n. During 24 November 1998 event, however, this ratio resulted about 10 times higher than normal coronal values.
Adriani O.
Ambriola M.
Bakaldin A.
Bartalucci Sergio
Bellotti Roberto
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