Modulation of Cosmic Rays at and beyond the Heliospheric Termination Shock

The modulation of cosmic ray is studied with a numerical model including a solar wind termination shock, a heliosheath and drifts. Results show interesting features caused by the termination shock and the heliosheath which differ markedly for the two polarity cycles, with energy and with increasing solar activity. The heliosheath is found to be a distinguishable modulation `barrier', esp ecially during solar minimum activity.