Thermospheric Density Model Biases at Sunspot Maximum by Carmen Pardini a , Kenneth Moe b and Luciano Anselmo a a Space Flight Dynamics Laboratory, ISTI/CNR, Pisa, Italy b Space Environment Technologies, Irvine, California, USA Technical Report CNR-ISTI/2011-TR-038 6 December 2011 Space Flight Dynamics Laboratory Istituto di Scienza e Tecnologie dell’Informazione “A. Faedo” CNR – Area della Ricerca di Pisa Via G. Moruzzi 1, 56124 Pisa, Italy