Voyager Enters Final Frontier Of Solar System |
Voyager Enters Final Frontier Of Solar System |
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Jun 3 2005, 10:47 PM
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http://planetary.org/news/2005/voyager-upd...ation_0524.html
Voyager 1, the most distant human-made object in space, has crossed the termination shock, the last major threshold in the solar system, team members announced today at the annual American Geophysical Union (AGU) meeting in New Orleans, Louisiana. |
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Sep 23 2006, 09:40 AM
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Junior Member Group: Members Posts: 21 Joined: 17-August 06 Member No.: 1048 |
There's a new story at science.nasa.gov about some of the things Voyager 1 has found within the heliosheath. Magnetic turbulence, a slower than expected solar wind, and unexpected anomalous cosmic ray intensities are the main things mentioned. I hope this helps make the case for continued funding.
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Apr 17 2008, 04:45 PM
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
This is not exactly a new: Voyager 2 entered the heliosheath on August 30, 2007.
http://voyager.jpl.nasa.gov/news/voyager_squashed.html However, incredibly, I completely ignored the event on this page and only now I "discovered" it by looking to these eloquent plots: http://web.mit.edu/space/www/voyager/voyag...plot_recent.gif (in the past, I was looking more often to these data but in recent months I'm more and more busy ). Looking to this Forum section, it seems nobody noticed it... cannot believe anyone missed it like me! Addendum: based on Solar System Simulator, cross occurred at 83.7 AU from sun, about 10 AU closer than Voyager-1! -------------------- I always think before posting! - Marco -
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Apr 17 2008, 09:11 PM
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Further infos: As you know, contrary to his brother, Voyager 2 has a working Plasma Science instrument that can directly measure the velocity, density and temperature of the solar wind.
I downloaded hourly data from this plasma science page. Following plots shows trend of measured proton speed, thermal speed (temperature) and density (second plot is a temporal enlargement covering the transition (window is 0.1 years or 36.5 days large): As mentioned in the article, Voyager-2 had at least five shock crossings over a couple of days; perhaps they are the density peaks visible in second plot. QUESTION: why there is a so large hiatus (11 days) in the data immediately after this event??? Too strange for a coincidence! They also found a much lower temperature beyond the shock than was predicted; anyway, based on following scatter plots (referred to data in the narrow temporal window of second plot above) there is a good correlation (almost inverse-square) between these twoparameters: Any comment is welcomed! -------------------- I always think before posting! - Marco -
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