This service publishes spectral matrix data from the Earth magnetosphere obtained by the CLUSTER satellites. The data contains the upper triangle for the 5x5 correlation matrix of the three magnetic and two electric components of the electromagnetic field in 27 frequency bands in the SR2 reference frame. For more information, refer to http://caa.estec.ea.int/documents/UG/CAA_EST_UG_STA_v35.pdf.