{"id":30259,"date":"2025-02-21T07:25:23","date_gmt":"2025-02-21T01:55:23","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=30259"},"modified":"2025-04-10T09:16:11","modified_gmt":"2025-04-10T03:46:11","slug":"solar-coronal-holes","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/solar-coronal-holes\/","title":{"rendered":"Solar Coronal Holes"},"content":{"rendered":"<h2>Solar Coronal Holes Latest News<\/h2>\n<p>Recently, a new study has accurately estimated the physical parameters of thermal and magnetic field structures of solar coronal holes.<\/p>\n<h2>About Solar Coronal Holes<\/h2>\n<ul>\n<li>Coronal holes are dark regions in X-ray and extreme ultraviolet images of the Sun.<\/li>\n<li>These were <strong>discovered in the 1970s<\/strong> by X-ray satellites.<\/li>\n<\/ul>\n<h2>Features of Solar Coronal Holes<\/h2>\n<ul>\n<li>They appear dark because they <strong>are cooler, less dense regions<\/strong> than the surrounding plasma and are regions of open, unipolar magnetic fields.\u00a0<\/li>\n<li>They have <strong>open magnetic field lines<\/strong> and are hence important for understanding the interplanetary medium and space weather.<\/li>\n<li>Coronal holes can last between a few weeks to months. The holes are not a unique phenomenon, appearing throughout the <strong>sun\u2019s approximately 11-year solar cycle.<\/strong><\/li>\n<li>They can <strong>last much longer during solar minimum<\/strong> \u2013 a period of time when activity on the Sun is substantially diminished, according to NASA.<\/li>\n<\/ul>\n<h2>Significance of Solar Coronal Holes<\/h2>\n<ul>\n<li>The occurrences of coronal holes are associated with <strong>disturbances in the Earth&#8217;s ionosphere,<\/strong> the layer of the atmosphere that reflects and modifies the radio waves, leading to further communication issues.<\/li>\n<li>They have significant influence on <strong>space weather that affects satellites<\/strong>, as well as the Indian <strong>summer monsoon rainfall.<\/strong><\/li>\n<\/ul>\n<h2>Solar Coronal Holes FAQs<\/h2>\n<p><strong>Q1.<\/strong> What is a solar coronal hole?<\/p>\n<p><strong>Ans. <\/strong>A coronal hole is a large region in the corona which is less dense and is cooler than its surroundings.<\/p>\n<p><strong>Q2. <\/strong>What is ejected from the Sun&#8217;s coronal hole?<\/p>\n<p><strong>Ans. <\/strong>Coronal mass ejections (CMEs) are huge bubbles of coronal plasma threaded by intense magnetic field lines that are ejected from the Sun over the course of several hours.<\/p>\n<p><strong>Q3.<\/strong> Why do sunspots appear dark?<\/p>\n<p><strong>Ans. <\/strong>Sunspots are areas that appear dark on the surface of the Sun. They appear dark because they are cooler than other parts of the Sun&#8217;s surface.<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/pib.gov.in\/PressReleasePage.aspx?PRID=2104369\" target=\"_blank\" rel=\"nofollow noopener\">PIB<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Solar Coronal Holes are dark regions in X-ray and extreme ultraviolet images of the Sun<\/p>\n","protected":false},"author":5,"featured_media":30260,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-30259","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/30259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=30259"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/30259\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/30260"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=30259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=30259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=30259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}