Editing Sun (section)

=== Heliosphere===
{{Main|Heliosphere}}
[[File:PIA22835-VoyagerProgram&Heliosphere-Chart-20181210.png|thumb|left|Depiction of the [[heliosphere]]]]
The heliosphere is defined as the region of space where the solar wind dominates over the interstellar medium.<ref>{{cite book |last1=Parker |first1=E. N. |author1-link=Eugene Parker |editor1-last=Kamide |editor1-first=Yohsuke |editor2-last=Chian |editor2-first=Abraham C.-L. |title=Handbook of the Solar-Terrestrial Environment |date=2007 |publisher=Springer |location=Berlin |isbn=978-3-540-46315-3 |chapter=Solar Wind |doi=10.1007/978-3-540-46315-3 |bibcode=2007hste.book.....K |url=https://archive.org/details/handbookofsolart0000unse |url-access=registration}}</ref> Turbulence and dynamic forces in the heliosphere cannot affect the shape of the solar corona within, because the information can only travel at the speed of Alfvén waves. The solar wind travels outward continuously through the heliosphere,<ref>{{Cite web |date=22 April 2003 |title=A Star with two North Poles |url=https://science.nasa.gov/headlines/y2003/22apr_currentsheet.htm |url-status=dead |archive-url=https://web.archive.org/web/20090718014855/https://science.nasa.gov/headlines/y2003/22apr_currentsheet.htm |archive-date=18 July 2009 |website=Science @ NASA |publisher=NASA}}</ref><ref>{{Cite journal |last1=Riley |first1=P. |last2=Linker |first2=J. A. |last3=Mikić |first3=Z. |date=2002 |title=Modeling the heliospheric current sheet: Solar cycle variations |journal=[[Journal of Geophysical Research]] |volume=107 |issue=A7 |pages=SSH 8–1 |bibcode=2002JGRA..107.1136R |doi=10.1029/2001JA000299 |id=CiteID 1136 |doi-access=free}}</ref> forming the solar magnetic field into a [[Parker spiral|spiral]] shape,<ref name=Russell2001 /> until it impacts the [[Heliopause (astronomy)|heliopause]] more than {{val|50|u=AU}} from the Sun. In December 2004, the ''[[Voyager 1]]'' probe passed through a shock front that is thought to be part of the heliopause.<ref>{{Cite press release |title=The Distortion of the Heliosphere: Our Interstellar Magnetic Compass |date=2005 |publisher=[[European Space Agency]] |url=http://www.spaceref.com/news/viewpr.html?pid=16394 |access-date=22 March 2006 |url-status=live |archive-url=https://archive.today/20120604110953/http://www.spaceref.com/news/viewpr.html?pid=16394 |archive-date=4 June 2012}}</ref> In late 2012, ''Voyager 1'' recorded a marked increase in [[cosmic ray]] collisions and a sharp drop in lower energy particles from the solar wind, which suggested that the probe had passed through the heliopause and entered the [[interstellar medium]],<ref>{{Cite press release |last=Landau |first=Elizabeth |url=https://voyager.jpl.nasa.gov/news/details.php?article_id=44 |title=Voyager 1 Helps Solve Interstellar Medium Mystery |publisher=[[Jet Propulsion Laboratory]] |date=29 October 2015 |url-status=live |archive-url=https://web.archive.org/web/20230803125531/https://voyager.jpl.nasa.gov/news/details.php?article_id=44 |archive-date=3 August 2023}}</ref> and indeed did so on 25 August 2012, at approximately 122 astronomical units (18&nbsp;Tm) from the Sun.<ref>{{Cite web |url=https://voyager.jpl.nasa.gov/mission/interstellar-mission/ |title=Interstellar Mission |publisher=[[Jet Propulsion Laboratory]] |access-date=14 May 2021 |archive-date=14 September 2017 |archive-url=https://web.archive.org/web/20170914060928/https://voyager.jpl.nasa.gov/mission/interstellar-mission/#:~:text=On%20Aug.,billion%20kilometers)%20from%20the%20sun. |url-status=live}}</ref> The heliosphere has a [[Heliosphere#Heliotail|heliotail]] which stretches out behind it due to the Sun's [[peculiar motion]] through the galaxy.<ref>{{cite web |last1=Dunbar |first1=Brian |title=Components of the Heliosphere |url=https://www.nasa.gov/mission_pages/sunearth/science/heliosphere-components.html |website=NASA |date=2 March 2015 |access-date=20 March 2021 |archive-date=8 August 2021 |archive-url=https://web.archive.org/web/20210808183941/https://www.nasa.gov/mission_pages/sunearth/science/heliosphere-components.html |url-status=live}}</ref>