{"id":128,"date":"2014-08-25T12:25:10","date_gmt":"2014-08-25T10:25:10","guid":{"rendered":"https:\/\/site.uit.no\/spaceweather\/?p=128"},"modified":"2014-08-25T12:25:10","modified_gmt":"2014-08-25T10:25:10","slug":"solar-event-and-its-effect-on-the-ground-in-scandinavia","status":"publish","type":"post","link":"https:\/\/site.uit.no\/spaceweather\/2014\/08\/25\/solar-event-and-its-effect-on-the-ground-in-scandinavia\/","title":{"rendered":"Solar event and its effect on the ground in Scandinavia"},"content":{"rendered":"<p>Yesterday (24. August) there was an X-ray event on the sun. Such events ionize the dayside ionosphere above &#8220;normal&#8221; levels and may cause blackouts. Here is the Alert issued by SWPC:<\/p>\n<p><em>Space Weather Message Code: SUMXM5<\/em><br \/>\n<em>Serial Number: 119<\/em><br \/>\n<em>Issue Time: 2014 Aug 24 1256 UTC<\/em><\/p>\n<p><em>SUMMARY: X-ray Event exceeded M5<\/em><br \/>\n<em>Begin Time: 2014 Aug 24 1200 UTC<\/em><br \/>\n<em>Maximum Time: 2014 Aug 24 1217 UTC<\/em><br \/>\n<em>End Time: 2014 Aug 24 1225 UTC<\/em><br \/>\n<em>X-ray Class: M5.9<\/em><br \/>\n<em>Optical Class: 2b<\/em><br \/>\n<em>Location: S07E77<\/em><br \/>\n<em>NOAA Scale: R2 &#8211; Moderate<\/em><\/p>\n<p><em>Comment: Impulsive M5\/2b flare from new Region 2151 near the SE limb. Type II (593 km\/s) and Tenflare (409 sfu) radio emissions associated with this event.<\/em><br \/>\n<em>Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.<\/em><br \/>\n<em>Radio &#8211; Limited blackout of HF (high frequency) radio communication for tens of minutes.<\/em><\/p>\n<p>And indeed effects were seen on the ground. Here are the raw riometer data from Skibotn and Ny-\u00c5lesund. A riometer measures the power of the background cosmic radiation. When the ionosphere increase in density at its lowest altitudes this radiation is absorbed and absorption is observed in the curve. I will at a later point write a post about the excellent instrument of riometers.<\/p>\n<figure id=\"attachment_129\" aria-describedby=\"caption-attachment-129\" style=\"width: 512px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_SKN30_flares.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-129\" src=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_SKN30_flares.png\" alt=\"Skibotn riometer raw data plot\" width=\"512\" height=\"384\" srcset=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_SKN30_flares.png 512w, https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_SKN30_flares-300x225.png 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><\/a><figcaption id=\"caption-attachment-129\" class=\"wp-caption-text\">Skibotn riometer raw data plot<\/figcaption><\/figure>\n<figure id=\"attachment_130\" aria-describedby=\"caption-attachment-130\" style=\"width: 512px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_NYA40_flares.png\"><img decoding=\"async\" class=\"size-full wp-image-130\" src=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_NYA40_flares.png\" alt=\"Ny-\u00c5lesund riometer raw data plot\" width=\"512\" height=\"384\" srcset=\"https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_NYA40_flares.png 512w, https:\/\/site.uit.no\/spaceweather\/wp-content\/uploads\/sites\/194\/2014\/08\/cna_NYA40_flares-300x225.png 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><\/a><figcaption id=\"caption-attachment-130\" class=\"wp-caption-text\">Ny-\u00c5lesund riometer raw data plot<\/figcaption><\/figure>\n<p>Notice at 12 UT there is a small dip in the curves lasting for a little less than half an hour. That is the effect of the x-ray event and indicates some absorption of HF signals at 30 and 40 MHz. Now, both Skibotn and Ny-\u00c5lesund are at hight latitudes, if one moved closer to the sub-solar point one would probably see even more absorption.<\/p>\n<p>The event was also seen to affect geomagnetic conditions a little at most latitudes of the TGO magnetometer network, see the simultanous dip in the curves at 12 UT in the <a href=\"http:\/\/flux.phys.uit.no\/cgi-bin\/mkstackplot.cgi?&amp;comp=H&amp;nor=&amp;Sync=1408921200&amp;\">stackplot<\/a>.<\/p>\n<p>Nothing dramatic about this space weather event, but it illustrates quite nicely one of the ways the Sun may affect conditions here on Earth<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday (24. August) there was an X-ray event on the sun. Such events ionize the dayside ionosphere above &#8220;normal&#8221; levels and may cause blackouts. Here is the Alert issued by SWPC: Space Weather Message Code: SUMXM5 Serial Number: 119 Issue Time: 2014 Aug 24 1256 UTC SUMMARY: X-ray Event exceeded &#8230;<\/p>\n","protected":false},"author":430,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-128","post","type-post","status-publish","format-standard","hentry","category-uncategorized","column","threecol"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Solar event and its effect on the ground in Scandinavia - Norwegian Centre for Space Weather (NOSWE)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/site.uit.no\/spaceweather\/2014\/08\/25\/solar-event-and-its-effect-on-the-ground-in-scandinavia\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Solar event and its effect on the ground in Scandinavia - Norwegian Centre for Space Weather (NOSWE)\" \/>\n<meta property=\"og:description\" content=\"Yesterday (24. 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