Data from the CRIS instrument have been used to calculate the level of solar modulation as a function of time, from late 1997 through mid-2007.
Plot of solar modulation parameter (phi), as a function of time, using CRIS C, O, Mg, Si, and Fe data. PDF format.
Description of the technique used may be found in Wiedenbeck et al., Proc. 29th ICRC (Pune), vol. 2, pp. 277-280 (2005).
Last modified: Thu Apr 13 2006