The 2012 crossing is confirmed from plasma oscillations

Assembled from 55 blocks · 1 evidence · 65 related

1. Story
2. Gurnett, Kurth and colleagues published measurements from Voyager 1's plasma wave subsystem showing electron oscillations near 2.6 kilohertz during two intervals in late 2012 and spring 2013. Because the oscillation frequency depends only on electron density, the tone implied about 0.08 electrons per cubic centimetre — far denser than solar wind at that distance and consistent with interstellar plasma. The announcement came thirteen months after the crossing itself, because the evidence needed a disturbance from the Sun to arrive and set the surrounding plasma ringing.
3. Knowledge
4. Voyager 1
5. Heliopause
6. Plasma Wave Subsystem (PWS)
7. Edward C. Stone
8. The 2012 crossing is confirmed from plasma oscillations
9. Connections
10. Heliopause
11. Plasma Wave Subsystem (PWS)
12. Voyager 1
13. Edward C. Stone
14. Very local interstellar medium
15. Heliosphere
16. Voyager 1 crosses the heliopause at 121.6 AU
17. The 2012 crossing is confirmed from plasma oscillations
18. Voyager 2 crosses the heliopause at 119 AU
19. Voyager 1
20. The 2012 crossing is confirmed from plasma oscillations
21. The Grand Tour alignment
22. Voyager 2
23. Multi-Hundred-Watt radioisotope thermoelectric generator
24. Titan
25. NASA Deep Space Network
26. Gravity assist
27. Jet Propulsion Laboratory
28. Launch Complex 41, Cape Canaveral
29. Jupiter
30. Saturn
31. Titan
32. Voyager high-gain antenna
33. Plasma Wave Subsystem (PWS)
34. Titan IIIE-Centaur
35. Edward C. Stone
36. The Voyager Golden Record
37. Carl Sagan
38. Pale Blue Dot
39. The full Grand Tour is cancelled and rebuilt as a two-spacecraft mission
40. Voyager 1 launches
41. Voyager 1 closest approach to Jupiter
42. Active volcanism found on Io
43. Voyager 1 passes Saturn and Titan, and leaves the plane of the planets
44. Voyager 1 photographs the solar system from outside it
45. Voyager 1 crosses the termination shock at about 94 AU
46. Voyager 1 crosses the heliopause at 121.6 AU
47. The 2012 crossing is confirmed from plasma oscillations
48. Voyager 1's cosmic ray subsystem is switched off
49. Voyager 1's low-energy charged particle instrument due for shutdown
50. Voyager 1 reaches one light-day from Earth
51. Voyager 1
52. Voyager 2
53. The 2012 crossing is confirmed from plasma oscillations
54. Evidence
55. Voyager 1's plasma wave instrument recorded electron plasma oscillations near 2.6 kHz in October–November 2012 and April–May 2013, implying an electron density of about 0.08 cm⁻³ and indicating that the spacecraft had been in interstellar plasma continuously since the boundary crossings of July–August 2012, dated 25 August 2012 at 121.6 AU. V55 verification basis: the paper is on a publisher domain blocked to this session, but search results carried the frequency, the density and the crossing date and distance and attributed them to this paper.