Electron pitch angle variations recorded at the high magnetic latitude boundary layer by the NUADU instrument on the TC-2 spacecraft - Lu,L; McKenna-Lawlor,S; Barabash,S; Liu,ZX; Balaz,J; Brinkfeldt,K; Strharsky,I; Shen,C; Shi,JK; Cao,JB; Fu,SY; Gunell,H; et al. (ANNALES GEOPHYSICAE, 2005)