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Ever since the Apollo era, a question has remained as to the origin of thelunar swirls (high albedo regions coincident with the regions of surfacemagnetization). Different processes have been proposed for their origin. Inthis work we test the idea that the lunar swirls have a higher albedo relativeto surrounding regions because they deflect incoming solar wind particles thatwould otherwise darken the surface. 3D particle tracking is used to estimatethe influence of five lunar magnetic anomalies on incoming solar wind. Theregions investigated include Mare Ingenii, Gerasimovich, Renier Gamma,Northwest of Apollo and Marginis. Both protons and electrons are tracked asthey interact with the anomalous magnetic field and impact maps are calculated.The impact maps are then compared to optical observations and comparisons aremade between the maxima and minima in surface fluxes and the albedo and opticalmaturity of the regions. Results show deflection of slow to typical solar windparticles on a larger scale than the fine scale optical, swirl, features. It isfound that efficiency of a particular anomaly for deflection of incomingparticles does not only scale directly with surface magnetic field strength,but also is a function of the coherence of the magnetic field. All anomalousregions can also produce moderate deflection of fast solar wind particles. Theanomalies' influence on ~ 1 GeV SEP particles is only apparent as a slightmodification of the incident velocities.

Simulations of Particle Impact at Lunar Magnetic Anomalies and Comparison with Spectral Observations