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Apologies for having never posted here before, likely never again... but "The probably sausage-shaped bubbles"... doesnt that sound like it was lifted from "The Third Policeman?" Has anyone checked to make sure that its true and not a joke? — Preceding unsigned comment added by 69.14.22.166 ( talk) 14:02, 5 September 2012 (UTC)
The image Image:Voyager 1 entering heliosheath region.jpg is due up as Wikipedia:Picture of the Day on Sunday and so will also be shown on the Main Page. This picture illustrates a range of related articles, but I've decided that Heliosphere is probably the most useful primary link.
The associated caption is at Wikipedia:Picture of the day/August 21, 2005. The caption is normally based on excepts drawn from the illustrated article, but in this case I've had to take snippets from several different places. Hopefully, someone editing this page, can take a look at the caption and make sure it still makes sense. In particular it looks like the December 2004 date for Voyager 1 entering the heliosheath may not be universally accepted just yet. -- Solipsist 11:48, 19 August 2005 (UTC)
How exactly is 250,000 mph subsonic?
On the main Sun entry, the rotational period for the sun is shown to range between 25 and 35 days, but a full rotation is 28 (see opening paragraph of the Sun#Structure section.) I'm assuming that the 27 on this entry refers to the 28 on that entry (or vice versa.) I don't know which one is correct (if either) but I'd just like to point out the discrepancy. Tonytnnt 06:21, 5 March 2007 (UTC)
Firstly there should be a consensus on the spelling of Voyager 2, in this article it uses both Voyager 2 and Voyager II, I believe the correct usage is the numeric (Voyager 2).
Also exactly when Voyager I passed through the termination shock is contradicted within the article. The worst paragraph is the one below which contradicts the article and is badly written therefore I'm suggesting removing it completely but leaving the old version here.
In May 2005, it was announced that Voyager 1 had crossed the termination shock and entered the heliosheath in December 2004, at a distance of 85 AU. In contrast, Voyager II began detecting returning particles suggesting it was entering the termination shock when it was only 76 AU from the sun, in May 2006. This implies that the heliosphere may be irregularly shaped, bulging outwards in the sun's northern hemisphere and pushed inward in the south.[5] Master z0b 05:33, 5 September 2007 (UTC)
This contradicts the previous statement "In May 2005, NASA announced that Voyager 1 had crossed the termination shock and entered the heliosheath in December 2004, at a distance of 94 AU. An earlier report that this had occurred in August 2002 (at 85 AU) is now generally believed to have been premature." now I'm no scientist so I don't know what the general consensus is. Master z0b 05:37, 5 September 2007 (UTC)
·There is another contradiction. In one spot the article states that Voyager 1 entered the heliosheath in 2004, while a little ways down, it gives a 2006 date. 96.32.132.115 ( talk) 04:20, 7 April 2008 (UTC)Steve
I added IBEX and Cassini observation info. which conflicts with the info describing the bow shock and tail. However, since that info is presented as a hypothesis and since the observations I added are so recent, I made no further modifications. This does result in there being conflicting info. on the page, which is inevitable, I guess, when suddenly new data changes prior theories. Hopefully someone more knowledgeable than me will revise the entire article for consistency as more data is available. Canuck100 ( talk) 21:16, 22 October 2009 (UTC)
The 2nd paragraph talks of 10 billion miles, then kilometers per hour. Shouldn't the article use the same units (miles/kilometers) throughout? —Preceding unsigned comment added by 169.3.168.209 ( talk) 17:26, 18 September 2007 (UTC)
In "Outer structure" the speed of sound is stated as 340 m/s, while in "Termination shock" it is 100 km/s. Which one is correct? (seems like 100 km/s, but I am not sure...) Reminiscenza 20:42, 8 October 2007 (UTC)
The article, in its discussion of the Voyager findings, hints that the heliopause might be 70 - 94 AU from the Sun. Another quote states that the bowshock (outside the heliopause) is perhaps 230 AU away.
This is far less than the aphelion of many long-term comets. It is also far less than the aphelion of Sedna (976 AU, according to the Wikipedia article on it) and 2000 CR 105 (396 AU) (ditto). Not to mention the hypothetical Oort Cloud, which is 50,000 AU away!
If the heliopause is that close, the "outer border of the Solar System" sentence should be deleted. Captcrisis 02:42, 12 October 2007 (UTC)captcrisis
This article was automatically assessed because at least one WikiProject had rated the article as start, and the rating on other projects was brought up to start class. BetacommandBot 09:54, 10 November 2007 (UTC)
According to " http://www.reuters.com/article/scienceNews/idUSN1044867120071211?sp=true",
Voyager scientists had expected the temperatures within the termination shock to be about 1,000,000 degrees Fahrenheit (555,500 C) as material normally slows down and is heated up when it encounters an obstacle in a normal shock wave.
But according to Edward Stone of California Institute of technology, the temperatures registered were much lower, at around 200,000 degrees F (111,100 C). Also, Voyager 1 made only one crossing into the termination shock while Voyager 2 has made at least five shock crossings over several days which allowed them to collect more data.
What does this mean? How can one measure temperature in space -- and what do such high temperatures mean? Chip Unicorn ( talk) 18:20, 12 December 2007 (UTC)
By Hot, what is really meant is that they, the little bits (Hydrogen nucelii for the most part) are moving VERY quickly. Because there's so few of them, (which partially allows them to go so fast and thus be so hot), you won't get cooked. DanOrbis ( talk) —Preceding undated comment added 03:36, 6 February 2013 (UTC)
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So do these termination shock and bow shock have any effect on spacecraft passing through them? Will they damage or destroy them, or will they pass through unharmed? JIP | Talk 18:07, 17 January 2009 (UTC)
I read this on the Wikipedia page of the Sun at topic: Present anomalies
I couldn't find any reference ... sounds a bit bold Michel_sharp ( talk) 21:38, 4 March 2010 (UTC)
It's the dynamic pressure of the solar wind that determines the size of the heliosphere, not the strength of the solar (or interplanetary) magnetic field. So unless the solar wind density or velocity has had a similarly dramatic decrease in recent times (it has changed, but I'm not sure in what way or how much) the size of the heliosphere won't be significantly effected. Cosmic rays are effected by the magnetic field though - their fluxes appear to be higher near solar minima.
Reminiscenza 20:42, 8 October 2007 (UTC)
This article continuously mentions pre-2009 model and then disproves it with the current one. I think all mentions about pre-2009 model should be moved into separate History section. 85.141.78.156 ( talk) 15:18, 2 June 2011 (UTC)
I believe the 2009 'update' which suggests there is no heliotail is not as standard as it seems to be presented in this article.
I seem to recall that the pressure was miscalculated in the key paper that set forth this idea. This led to the erroneous conclusion that the magnetic & thermal pressures were comparable and thus that the heliosphere might have a 'bubble' shape.
Unfortunately I have not found any sources which explicitly refer to this. However, all recent artistic renditions from NASA press releases (including the 'bubble region' image from 2011) show a heliotail, which seems to suggest that this is once again the standard picture.
Sorry for not being able to uncover the research myself at this moment, but I thought it was important to point this out so that someone can track it down.
96.255.47.204 ( talk) 05:29, 22 June 2012 (UTC)
New updates from NASA: 1. Uploaded the "new heliopause" image here. Reh man 03:16, 10 June 2011 (UTC)
Some parts of the article use solar to describe features of stars in general. E.g. under the section "Termination Shock" we have "solar wind particles are emitted from stars at about 400 km/s". Even "the solar wind slows down to subsonic speed (relative to the star)" seems unnecessarily vague. Am I being pedantic, shouldn't solar only be applied to our Sun? JBel ( talk) 17:57, 15 June 2012 (UTC)
The article mentions at least 8 separate times the fact that there is no bow shock-this seems repetitive and unnecessary. Could these mentions be consolidated, and some mention of what current theories speculate the boundary is like? Mynameisntbob1 ( talk) 20:48, 5 December 2012 (UTC)
This article needs definitions of the area which is inside the termination shock. -- Artman40 ( talk) 13:15, 11 December 2012 (UTC)
Is it worth including in the article that the edge of the heliosphere was once speculated to be in the vicinity of Jupiter? Apparently that's where it was expected to be encountered when the Pioneer probes of the early 1970s flew past Jupiter. I think it would be worthwhile to mention, especially since it might instigate some thought about how being in the interstellar region might have affected conditions on the planets further out. That the heliosphere extends out beyond the known planets means they exist in basically the same electric environment as Jupiter and the inner planets, and there's no reason those planets' conditions should be any different. But, how would a planet like, say, Neptune, be affected if it was outside the heliosphere? Is there any scientific thought published about this? GBC ( talk) 17:47, 28 January 2013 (UTC)
In the article it states that:
"On March 20, 2013 a study was released that suggested that Voyager 1 likely cleared the heliopause on August 25, 2012, judging by drastic changes in Radiation levels."
However, NASA made a press release shortly after correcting this:
http://www.jpl.nasa.gov/news/news.php?release=2013-107
...I'm not a specialist though, and I have no idea what this means, so rather than editing, I thought I might just note it and let you guys figure it out.
128.210.206.145 ( talk) 07:55, 1 April 2013 (UTC)
New data from IBEX shows that the heliotail does exist. Here is the webpage that has photos and news related to this. Please update.
Headline: "Video: Sun has 'flipped upside down' as new magnetic cycle begins" (Dated Sunday 29 December 2013)
Reader-comments under the UK article are interesting. — Charles Edwin Shipp ( talk) 13:35, 30 December 2013 (UTC)
The repetition was mainly about Voyager 1 and 2 going through the termination shock. Got that fixed! DSCrowned ( talk) 12:38, 13 July 2014 (UTC) DSCrowned ( talk) 12:38, 13 July 2014 (UTC)
Naive question from an intelligent but ignorant reader. What happens to the particles of the solar wind at the heliopause? Do they eventually escape and become part of interstellar matter? -- Richardson mcphillips ( talk) 18:58, 1 June 2015 (UTC)
@ Isambard Kingdom: IANA expert, so I will defer to you on this one for now, but I have the distinct sense that the solar wind section is confused at best. The main Solar wind article never discusses magnetic fields as part of the solar wind, defining solar wind as "a stream of plasma released from the upper atmosphere of the Sun. It consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV." Magnetic fields modulate and propel the solar wind and can be induced by the solar wind's collision with Earth's magnetosphere. But to my (admittedly non-expert) ears, statements like "As the Sun rotates ... the magnetic field transported by the solar wind gets wrapped into a spiral" are patent nonsense. That statement also contradicts the earlier (and also wrong, I think) statement that the solar wind consists partially of magnetic fields-- it's not even self-consistent. A2soup ( talk) 15:46, 22 June 2015 (UTC)
This article is important enough that it deserves to be written coherently. The text should not contain (lots and lots of) badly formed sentences and enigmatic statements such as "Due to the particles in the tail, they do not shine..." 72.226.32.104 ( talk) —Preceding undated comment added 13:00, 23 June 2016 (UTC)
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The very first picture ( File:Voyager_1_entering_heliosheath_region.jpg ) is outdated and very misleading: i) the colorful bow shock very probably doesn't exist; ii) the heliosphere probably does not have that long "comet" tail, it is rather spherical, iii) it shows the Voyagers' position of more than one decade ago; V1 is now beyond the heliopause, V2 closely before. There is a very good and up-to-date picture in http://www.sci-news.com/space/solar-systems-heliosphere-04805.html -- can this be used? -- Wassermaus ( talk) 16:18, 18 March 2018 (UTC)
If the hydrogen wall was detected by Voyager and then confirmed in 2018, then it is not hypothetical any longer, and the language in the article should be changed accordingly. Cheers, Rowan Forest ( talk) 14:52, 10 August 2018 (UTC)
So this band (original) had a tune called Broke Down World. Catchy ending. Heard of them? Pokesmot420 ( talk) 23:41, 6 December 2018 (UTC)
Re "The mission of the Voyager 1 and 2 spacecraft is to find and study the termination shock, heliosheath, and heliopause."
I think that should be qualified. I think the primary mission of those is (was) something else. E.g., "The current mission of..." or "A mission of...".