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Forbush decreases (FDs) are depletions in the galactic cosmic ray (GCR) countrate that last typically for about a week and can be caused by coronal massejections (CMEs) or corotating interacting regions (CIRs). Fast CMEs that driveshocks cause large FDs that often show a two-step decrease where the first stepis attributed to the shock/sheath region, while the second step is attributedto the closed magnetic structure. Since the difference in size of shock andsheath region is significant, and since there are observed effects that can berelated to shocks and not necessarily to the sheath region we expect that thephysical mechanisms governing the interaction with GCRs in these two regionsare different. We therefore aim to analyse interaction of GCRs withheliospheric shocks only. We approximate the shock by a structure where themagnetic field linearly changes with position within this structure. We assumeprotons of different energy, different pitch angle and different incomingdirection. We also vary the shock parameters such as the magnetic fieldstrength and orientation, as well as the shock thickness. The resultsdemonstrate that protons with higher energies are less likely to be reflected.Also, thicker shocks and shocks with stronger field reflect protons moreefficiently.

On the Interaction of Galactic Cosmic Rays with Heliospheric Shocks During Forbush Decreases