Effects of solar activity on noise in CALIOP profiles above the South Atlantic Anomaly - École polytechnique Accéder directement au contenu
Article Dans Une Revue Atmospheric Measurement Techniques Année : 2014

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

Résumé

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.
Fichier principal
Vignette du fichier
amt-7-1597-2014.pdf (788.54 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01083512 , version 1 (17-11-2014)

Identifiants

Citer

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, 2014, 7, pp.1597-1603. ⟨10.5194/amt-7-1597-2014⟩. ⟨hal-01083512⟩
326 Consultations
253 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More