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In mid-2012, a GMIR observed by Voyager 2 crossed through the heliosheath andcollided with the heliopause, generating a pressure pulse that propagated intothe very local interstellar medium. The effects of the transmitted wave wereseen by Voyager 1 just 93 days after its own heliopause crossing. The passageof the transient was accompanied by long-lasting decreases in galactic cosmicray intensities that occurred from ~2012.55 to ~2013.35 and ~2012.91 to~2013.70 at Voyager 2 and Voyager 1, respectively. Omnidirectional (>20 MeV)proton-dominated measurements from each spacecraft's Cosmic Ray Subsystemreveal a remarkable similarity between these causally-related events, with acorrelation coefficient of 91.2% and a time-lag of 130 days. Knowing thelocations of the two spacecraft, we use the observed time-delay to calculatethe GMIR's average speed through the heliosheath (inside the heliopause) as afunction of temperature in the very local interstellar medium. This, combinedwith particle, field, and plasma observations enables us to infer previouslyunmeasured properties of the heliosheath, including a range of sound speeds andtotal effective pressures. For a nominal temperature of ~20,000 K just outsidethe heliopause, we find a sound speed of 314 (+/-) 32 km/s and total effectivepressure of 267 (+/-) 55 fPa inside the heliopause. We compare these resultswith the Interstellar Boundary Explorer's data-driven models of heliosheathpressures derived from energetic neutral atom fluxes (the globally distributedflux) and present them as additional evidence that the heliosheath's dynamicsare driven by suprathermal energetic processes.

Heliosheath Properties Measured from a Voyager 2 to Voyager 1 Transient