Effects of solar activity on noise in CALIOP profiles above the South Atlantic Anomaly

Abstract : We show that nighttime dark noise measurements from the spaceborne lidar CALIOP contain valuable infor-mation about the evolution of upwelling high-energy ra-diation levels. Above the South Atlantic Anomaly (SAA), CALIOP dark noise levels fluctuate by ±6 % between 2006 and 2013, and follow the known anticorrelation of local par-ticle flux with the 11-year cycle of solar activity (with a 1-year lag). By analyzing the geographic distribution of noisy profiles, we are able to reproduce known findings about the SAA region. Over the considered period, it shifts westward by 0.3 • year −1 , and changes in size by 6 • meridionally and 2 • zonally, becoming larger with weaker solar activity. All results are in strong agreement with previous works. We pre-dict SAA noise levels will increase anew after 2014, and will affect future spaceborne lidar missions most near 2020.
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V. Noel, H. Chepfer, C. Hoareau, M. Reverdy, G. Cesana. Effects of solar activity on noise in CALIOP profiles above the South Atlantic Anomaly. Atmospheric Measurement Techniques, European Geosciences Union, 2014, 7, pp.1597-1603. ⟨10.5194/amt-7-1597-2014⟩. ⟨hal-01083512⟩

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