A Review of Voyager 1 Magnetic Field Observations at the Termination Shock and Heliosheath

Voyager 1 crossed the termination shock on 16 December 2004 at 94.0 astronomical units and has been in the heliosheath since that date. The spacecraft has now crossed the 100 AU mark and continues to acquire magnetic field data in this unexplored region of the heliosphere. The magnetic field increased by a factor of ~3 across the shock and its average value was ~0.14 nT through day 110 of 2005 exhibiting peaks as large as 0.31 nT with large amplitude fluctuations. The distribution functions of hour averages of the magnetic field in the heliosheath are Gaussian and the turbulence is compressible and isotropic on scales as short as 48 seconds. Trains of magnetic holes and humps have been observed resembling magnetic field fluctuations observed in planetary magnetosheaths. They represent a class of compressive fluctuations that are frequently observed in the heliosheath. In this talk we review these and other observations obtained by the Voyager Magnetic Field Investigation.