{"id":120108,"date":"2020-06-05T10:04:28","date_gmt":"2020-06-05T20:04:28","guid":{"rendered":"https:\/\/www.hawaii.edu\/news\/?p=120108"},"modified":"2020-06-05T10:04:28","modified_gmt":"2020-06-05T20:04:28","slug":"ifa-mysteries-of-sun-corona","status":"publish","type":"post","link":"https:\/\/www.hawaii.edu\/news\/2020\/06\/05\/ifa-mysteries-of-sun-corona\/","title":{"rendered":"Eclipse data illuminate mysteries of Sun\u2019s corona"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading time: <\/span> <span class=\"rt-time\"> 2<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><figure id=\"attachment_120114\" aria-describedby=\"caption-attachment-120114\" style=\"width: 676px\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-total-solar-eclipse.jpg\" alt=\"total solar eclipse\" width=\"676\" height=\"381\" class=\"size-full wp-image-120114\" srcset=\"https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-total-solar-eclipse.jpg 676w, https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-total-solar-eclipse-300x169.jpg 300w, https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-total-solar-eclipse-130x73.jpg 130w\" sizes=\"auto, (max-width: 676px) 100vw, 676px\" \/><figcaption id=\"caption-attachment-120114\" class=\"wp-caption-text\">White-light images of the solar corona during the 2019 total solar eclipses in Chile. (Photo credit: Solar Wind Sherpas)<\/figcaption><\/figure>\n<p>Researchers at the <a href=\"http:\/\/ifa.hawaii.edu\">University of <span aria-label=\"Hawaii\">Hawai&#699;i<\/span> Institute for Astronomy<\/a> (<abbr>IfA<\/abbr>) have been hard at work studying the solar corona, the outermost atmosphere of the sun that expands into interplanetary space. The properties of the solar corona are a consequence of the sun\u2019s complex magnetic field, which is produced in the solar interior and extends outward into space.<\/p>\n<p><abbr>IfA<\/abbr> graduate student <strong>Benjamin Boe<\/strong> conducted a new study that used total solar eclipse observations to measure the shape of the coronal magnetic field with higher spatial resolution and over a larger area than ever before. The <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/1538-4357\/ab8ae6\">results were published in the <em>Astrophysical Journal<\/em><\/a> on June 3.<\/p>\n<ul>\n<li>More on Habbal\u2019s research: <a href=\"https:\/\/www.hawaii.edu\/news\/2020\/01\/21\/eclipse-chaser-astronomer-habbal\/\">&lsquo;Eclipse Chaser&rsquo; children\u2019s book features <abbr title=\"东精影业\">东精影业<\/abbr> astronomer<\/a>, January 21, 2020<\/li>\n<\/ul>\n<figure id=\"attachment_120113\" aria-describedby=\"caption-attachment-120113\" style=\"width: 300px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-corona-magnetic-field-300x285.jpg\" alt=\"magnetic field renders\" width=\"300\" height=\"285\" class=\"size-medium wp-image-120113\" srcset=\"https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-corona-magnetic-field-300x285.jpg 300w, https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-corona-magnetic-field-130x124.jpg 130w, https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-corona-magnetic-field.jpg 350w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-120113\" class=\"wp-caption-text\">High-resolution images of the solar corona. Top panels show the visible light (color inverted), lower panels show the magnetic field shape.<\/figcaption><\/figure>\n<p>Boe was advised by <abbr>东精影业<\/abbr> M\u0101noa Astronomy Professor <strong>Shadia Habbal<\/strong>, a coronal research expert. Habbal has led a group of eclipse chasers, the <a href=\"https:\/\/project.ifa.hawaii.edu\/solarwindsherpas\/\">Solar Wind Sherpas<\/a>, making scientific observations during solar eclipses for more than 20 years. These observations have led to breakthroughs in unveiling some of the secrets of the physical processes defining the corona.<\/p>\n<p>&ldquo;The corona has been observed with total solar eclipses for well over a century, but never before had eclipse images been used to quantify its magnetic field structure,&rdquo; explained Boe. &ldquo;I knew it would be possible to extract a lot more information by applying modern image processing techniques to solar eclipse data.&rdquo;<\/p>\n<p>Boe traced the pattern of the distribution of magnetic field lines in the corona, using an automatic tracing method applied to images of the corona taken during 14 eclipses the past two decades. This data provided the chance to study changes in the corona over two 11-year magnetic cycles of the Sun.<\/p>\n<p>Boe found that there were very fine-scale structures throughout the corona. Higher resolution images showed smaller-scale structures, implying that the corona is even more structured than what was previously reported. To quantify these changes, Boe measured the magnetic field angle relative to the Sun\u2019s surface.<\/p>\n<figure id=\"attachment_120123\" aria-describedby=\"caption-attachment-120123\" style=\"width: 350px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.hawaii.edu\/news\/wp-content\/uploads\/2020\/06\/manoa-ifa-coronal-gif.gif\" alt=\"animated magnetic field render\" width=\"350\" height=\"302\" class=\"size-full wp-image-120123\" \/><figcaption id=\"caption-attachment-120123\" class=\"wp-caption-text\">An illustration of the Sun\u2019s corona magnetic field.<\/figcaption><\/figure>\n<p>During periods of minimum solar activity, the corona\u2019s field emanated almost straight out of the Sun near the equator and poles, while it came out at a variety of angles at mid-latitudes. During periods of maximum solar activity, the coronal magnetic field was far less organized and more radial.<\/p>\n<p>This work has further implications in other areas of solar research&#8212;including the formation of the solar wind, which impacts the Earth\u2019s magnetic field and can have effects on the ground, such as power outages.<\/p>\n<p>&ldquo;These results are of particular interest for solar wind formation. It indicates that the leading ideas for how to model the formation of the solar wind are not complete, and so our ability to predict and defend against space weather can be improved,&rdquo; Boe said.<\/p>\n<p><a href=\"http:\/\/www.ifa.hawaii.edu\/info\/press-releases\/corona_boe\/\">For more go to the <abbr>IfA<\/abbr> website.<\/a><\/p>\n<p><strong>Related <em><abbr>东精影业<\/abbr> News<\/em> Stories<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.hawaii.edu\/news\/2020\/01\/29\/first-light-inouye-solar-telescope\/\">Never-before-seen images of Sun released from world\u2019s largest solar telescope<\/a>, January 29,2020<\/li>\n<li><a href=\"https:\/\/www.hawaii.edu\/news\/2019\/04\/25\/sun-earns-nsf-award\/\"><abbr>东精影业<\/abbr> astronomer earns national award for solar research<\/a>, April 25, 2019<\/li>\n<li><a href=\"https:\/\/www.hawaii.edu\/news\/2017\/08\/16\/solar-eclipse\/\">Total solar eclipse illuminated by <abbr>东精影业<\/abbr> astronomers<\/a>, August 16, 2017\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A <abbr title=\"东精影业\">东精影业<\/abbr> M\u0101noa grad student used observations from total solar eclipses to measure the shape of the Sun\u2019s magnetic field.<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[34,35,1363,9],"class_list":["post-120108","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-astronomy","tag-institute-for-astronomy","tag-manoa-research","tag-uh-manoa","entry","has-media"],"aioseo_notices":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/posts\/120108","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/comments?post=120108"}],"version-history":[{"count":6,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/posts\/120108\/revisions"}],"predecessor-version":[{"id":120136,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/posts\/120108\/revisions\/120136"}],"wp:attachment":[{"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/media?parent=120108"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/categories?post=120108"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hawaii.edu\/news\/wp-json\/wp\/v2\/tags?post=120108"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}