Abstract
ABSTRACT New observations of the magnetic field from ≈2014.7 through 2016.3288, together with the previous observations dating back to 2012 August 25, show that Voyager 1 continued to observe draped interstellar magnetic fields in the outer heliosheath. During this time, the direction of was nearly constant (±3°), with no significant long-term trend. The slope of a linear least squares fit to the variation of the magnetic field strength B with time is (0.001 ± 0.001) nT yr−1, consistent with no net change, and the average B = (0.48 ± 0.04) nT. The new observations show a second “disturbed interval” in which B was for ≈267 days. This interval began with a weak shock on 2014/236 (2014.6438), contained oscillations in B with a 28 day period, and possibly ended with a pressure balanced structure or a reverse shock. It is likely this disturbed interval was associated with Sun/solar wind disturbances that impacted the heliopause and produced disturbances that propagated into the outer heliosheath. A quiet interval containing weaker less variable was observed from ≈2015.3700 until at least 2016.0. Unlike the previous quiet interval observed in the outer heliosheath, the direction of did not change linearly and could not be extrapolated to the center of the IBEX ribbon.
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