ИСТИНА

The energy spectra and relative abundances of 0.04-1 MeV/nucl 3He, 4He, C, O, Fe ions were investigated using ACE/ULEIS data at 1 AU in suprathermal particle uxes, which previously we showed to be the high energy tail of solar wind spectrum during quiet-time periods in 2006-2012. High variability with solar activity was observed in the Fe/O ratio whereas C/O and 3He/4He only modestly changed. During the period studied the energy spectra of all ions changed in the course of the solar cycle and depended on solar wind speed. The dierences of suprathermal Fe/O values between solar activity minimum and maximum were found to correlate with the dierences in Fe/O in the bulk solar wind. Owing to the unique prolonged solar activity minimum in 2007-2009 it became possible to obtain spectra of suprathermal tail ions in the slow and fast speed solar wind uxes from near equatorial coronal holes. The parameters of these spectra demonstrate a clear dependence on solar wind speed. The values of relative ion abundances exhibited dependence on suprathermal ion energy and on solar wind speed as well.