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This article reports nine Solar Energetic Particle events detected by theinstrument NINA between October 1998 and April 1999. NINA is a silicon-basedparticle detector mounted on-board the Russian satellite Resurs-01-N4, whichhas flown at an altitude of about 800 km in polar inclination since July 1998.For every solar event the power-law He4 spectrum across the energy interval10--50 MeV/n was reconstructed, and spectral indexes, gamma, from 1.8 to 6.8extracted. Data of He3 and He4 were used to determine the He3/He4 ratio, thatfor some SEP events indicated an enrichment in He3. For the 1998 November 7event the ratio reached a maximum value of 0.33+- 0.06, with spectral indexesof gamma = 2.5 +- 0.6 and gamma = 3.7 +- 0.3 for He3 and He4, respectively. TheHe3/He4 ratio averaged over the remaining events was 0.011 +- 0.004. For allevents the deuterium-to-proton ratio was determined. The average value over allevents was (3.9+-1.4) 10^{-5} across the energy interval 9--12 MeV/n. For oneevent (1998 November 24) this ratio yielded approximately 10 times higher thannormal coronal values. Upper limits on the H3/H1 counting ratio for all eventswere determined. For the 1998 November 14 SEP event the high flux of heavyparticles detected made it possible to reconstruct the carbon and oxygen flux.Comment: 42 pages, 14 figures, submitted to Journal of Geophysical Researc

Light Isotope Abundances in Solar Energetic Particles Measured by the Space Instrument NINA