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- W1748653965 abstract "The last two large solar energetic particle (SEP) events of solar cycle 23 were observed in December 2006 by several spacecraft including ACE and STEREO. Active regionnumber 10930 rotated over the eastern limb of the Sun already generating intense x-ray flares.As it crossed the disk, it produced 4 X-class flares and at least 3 halo coronal mass ejections.The two dominant SEP events occurred when the region was at ~E70 and ~W25. We havecombined particle observations from the Solar Isotope Spectrometer (SIS) and the Ultra-LowEnergy Isotope Spectrometer (ULEIS) on ACE and the Low Energy Telescope (LET) onSTEREO for each event. Energy spectra for many heavy ion species integrated over theduration of each SEP event show distinct differences between the two events. We find thesecond event (on December 13) has a much harder spectrum above 10 MeV/nucleon and a 12-60MeV/nucleon composition substantially enriched in elements with Z>14 as compared to the firstevent (on December 6). While the December 6 event is similar in Fe/O to other events withcomparable fluence in solar cycle 23, the December 13 event has the highest Fe/O ratio of allevents with Si fluence > 100 (cm^2 sr MeV/n)^-1. In composition, this second event is most similarto the event of November 6, 1997." @default.
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- W1748653965 date "2008-01-01" @default.
- W1748653965 modified "2023-09-26" @default.
- W1748653965 title "Examination of the Last Large Solar Energetic Particle Events of Solar Cycle 23" @default.
- W1748653965 doi "https://doi.org/10.1063/1.2982432" @default.
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