Based on the magnetic field and plasma data obtained by GEOTAIL in 1992-1995 and WIND in1994-2009,the magnetic field and plasma properties in the magnetotail ne
We complete the determination of the maximum sizes of (k,n)-arcs,n≤12,in the projective Hjelmslev planes over the two (proper) chain rings Z 9=Z/9Z and S 3=F 3