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Lyman-alpha albedo maps for the North and South poles were created using the first year of LAMP’s night-side observations. These maps focus on the regions poleward of 80 deg Latitude. Calibrated photon events are accumulated month by month and divided by model-based illumination signal at the corresponding times for each grid cell. Generally, we find good agreement between UV-dark regions and the coldest shaded craters revealed by the LRO/Diviner instrument. Identifying the cause of this albedo darkening requires future work and spectral analysis. Likely explanations include either the presence of UV-absorbing volatiles at the surface and/or a change in surface properties (e.g., roughness) at these interesting locations.

Ref: Retherford et al., Lunar and Planetary Sciences Conference, 2011.