Long-Term Modulation of the Cosmic Ray Fluctuation Spectrum: Spacecraft Measurements Starodubtsev, S. A. ; Usoskin, I. G. ; Grigoryev, A. V. ; Mursula, K. Abstract Publication: 29th International Cosmic Ray Conference (ICRC29), Volume 2 Pub Date: 2005 Bibcode: 2005ICRC....2..247S