Abstract
Two 3He- and Fe-rich impulsive solar particle events, measured by the SMS-experiment on the WIND-S/C., were studied at the low energy end of their spectrum (0.5- 225 keV/e) which could not be reached by other experimenters. It could be confirmed that during such events H+, 4He++ and all other ions are accelerated in some tens of seconds to the MeV-range. The SMS measurements showed as a new result that the 3He/4He ratio becomes very small at the low energy end of its spectrum (E < 75 keV/amu). From the two impulsive solar particle events it can be concluded that during the particle acceleration either the 3He content of the source region becomes exhausted or the acceleration process needs a certain injection energy. The model for the acceleration of impulsive solar particle events must simultaneously explain that H+ and 4He++ ions are detectable in the energy/charge range ∼30 – 225 keV/e.
At lower energies (0.5 – 9.5 keV/e) a pure solar wind composition was measured, indicating that the solar wind has another source region than the 3He-rich solar particle events.
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Kirsch, E. et al. (1999). Lower Cut-Off Energy Of 3He-Rich Solar Particle Events ?. In: Büchner, J., Axford, I., Marsch, E., Vasyliūnas, V. (eds) Plasma Astrophysics And Space Physics. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4203-8_52
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DOI: https://doi.org/10.1007/978-94-011-4203-8_52
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