摘要: Abstract There is evidence of a strong influence an atmospheric (cometary) interaction on the Martian tail formation: small total magnetic flux in tail, existence plasma flow apparently planetary origin, interplanetary field control orientation and other evidence. At same time large radius magnetotail (about 2 radii) can be considered as for field. Plasma properties are many respects similar to ones observed Venus. The limited amount near-Mars measurements leads some reservations coming definite conclusions. A combined magnetosphere Mars suggested that consists two polar-tied tubes connected equatorial Venus-type region in-between.