Modulation of cosmic rays and anomalous components by CIRs - Report of Working Group 5

CIRs produce clearly visible recurrent modulation in the intensity of cosmi c rays and anomalous components, but are not principally responsible for de termining the overall global level of modulation. However, the localized va riations imposed by CIRs in the parameters for propagation of energetic par ticles through the solar wind provide useful diagnostics for testing models of the propagation against observations. A principal result from Ulysses o bservations of CIR-induced variations is that the variations persist to ver y high latitudes, well beyond the range where CIRs are observed. This has d riven theoretical models to provide for enhanced latitude transport of ener getic particles. On the other hand, observations of Jovian electron intensi ties vs. latitude do not support enhanced latitude transport. This chapter contains a summary of the interaction between observations and models for t he effects of CIRs, and its impact on the understanding of the physics of m odulation.