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Proton monitor Las Dos Torres: First intercomparison of in-orbit results

The proton monitor on board NANOSAT 1B - Las Dos Torres (translated, The Two Towers) - and its preliminary results after two years in orbit are presented. This satellite was fully developed by INTA (National Institute of Aerospace Technique, Spain) and was launched on the 29th of July, 2009. The instrument includes two stacks of radiation sensing elements: the ‘dark’ and ‘light’ towers. The displacement damage was measured, both through the increase of a photodiode dark current (‘dark tower’), and the decrease of the photocurrent signal in a photodiode optically linked to an IRED (‘light tower’). The instrument was also designed to monitor the ionization current of the photodiodes and it can monitor variations in the proton flux in the South Atlantic Anomaly (SAA).