Authors: Ashraf Moradi (University of Arizona), Joe Giacalone (University of Arizona)

We obtain the anisotropy of the solar energetic particle flux at the location of magnetopause before it deviates by the geomagnetic field. To be relevant to the Alpha Magnetic Spectrometer-02 (AMS-02) onboard the International Space Station (ISS) and ground-level neutron monitors, we select the energy range of 300 MeV/n – 1 GeV/n. We release the 100 million protons impulsively near the Sun, integrate the trajectory of each particle and record the flux properties at each heliocentric latitude and longitude at 1au. The interplanetary magnetic field is the average Parker spiral with a flat heliospheric current sheet (HCS) on the Ecliptic plane in both IMF Polarities. The pitch-angle scattering is included with the mean free path of 1au that is relevant for the energy range of a few hundred MeV to several GeV (Cramp et. al. 1997). Then, we place Earth in various locations at the 1 au that flux of SEPs are statistically considerable and obtain the flux of SEPs in each direction at the magnetopause and construct a map. We identify 5 different locations at 1au sphere that the anisotropy map shows significant shift in the arrival directions of the SEP flux upon entering the magnetosphere. These regions differ based on magnetic connectivity to the source of the SEP near the Sun and proximity to the HCS. We find that the considerable variation in the incoming flux direction is due to the IMF polarity that decides the direction of the HCS drift, 𝛁B and curvature drifts. We also find that the the anisotropy map for each of the five regions is independent of the energy for 300MeV as well as 1 GeV protons. Also, the decreasing mean free path does not impact the first arriving particles, however, as the time passes, these patterns vanish due to the frequent pitch-angle scattering. In conclusion, we find that the IMF polarity, proximity to the HCS and magnetic connectivity have a significant impact on the incoming SEP flux direction at the magnetopause, however, the energy of the SEPs has no impact at all.