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We show that the electron thermal conductivity may strongly affect theheliosheath plasma flow and the global pattern of the solar wind (SW)interaction with the local interstellar medium (LISM). In particular, it leadsto strong reduction of the inner heliosheath thickness that makes possible toexplain (qualitatively) why Voyager 1 (V1) has crossed the heliopause atunexpectedly small heliocentric distance of 122 AU. To estimate the effect ofthermal conductivity we consider a limiting case when thermal conduction isvery effective. To do that we assume the plasma flow in the entire heliosphereis nearly isothermal.  Due to this effect, the heliospheric distance of the termination shock hasincreased by about 15 AU in V1 direction compared to the adiabatic case withgamma = 5/3. The heliospheric distance of the heliopause has decreased by about27 AU. As a result, the thickness of the inner heliosheath in the model hasdecreased by about 42 AU and become equal to 32 AU.

Electron thermal conduction as a possible mechanism to make the inner heliosheath thnner