In Situ Observations of Interstellar Plasma with Voyager 1

• DOI: 10.1126/science.1241681
• Publication Date: 2013-09-13T03:59:25Z
• Authors: D. A. Gurnett; W. S Kurth; L. F. Burlaga; N. F. Ness
• Keywords: 13. Climate action; 0103 physical sciences; 01 natural sciences

Finally Out

Last summer, it was not clear if the Voyager 1 spacecraft had finally crossed the heliopause—the boundary between the heliosphere and interstellar space.

Gurnett et al.

(p. 1489 , published online 12 September) present results from the Plasma Wave instrument on Voyager 1 that provide evidence that the spacecraft was in the interstellar plasma during two periods, October to November 2012 and April to May 2013, and very likely in the interstellar plasma continuously since the series of boundary crossings that occurred in July to August 2012.