{"id":1075,"date":"2015-06-22T09:49:22","date_gmt":"2015-06-22T07:49:22","guid":{"rendered":"https:\/\/site.uit.no\/spaceweather\/?p=1075"},"modified":"2015-06-22T16:36:23","modified_gmt":"2015-06-22T14:36:23","slug":"quiet-before-the-storm-over","status":"publish","type":"post","link":"https:\/\/site.uit.no\/spaceweather\/2015\/06\/22\/quiet-before-the-storm-over\/","title":{"rendered":"Quiet before the storm – over!"},"content":{"rendered":"

Last week (starting with June 18) the Sun has launched consecutive solar storms and M-class flares. The shock front of first storm (originating from active region 2371) hit Earth yesterday, around 16.40 UT, with sudden jumps in all measured solar wind properties (Figure 1).<\/p>\n

\"Solar<\/a>
Solar wind parameters of IMF, speed, and density at L1, provided by ACE.<\/figcaption><\/figure>\n

This sudden impulse caused a sudden but moderate enhancement in the GIC proxy dB\/dt measured at Troms\u00f8. Note that the field remains disturbed, which disturbances (especially around 21 and 06 UT) can be easily traced back to respective massive solar wind fluctuations depicted above.<\/p>\n

\"Troms\u00f8<\/a>
Rate of change of geomagnetic components (dB\/dt) at Troms\u00f8<\/figcaption><\/figure>\n

The global effect is clear from the following plot: at the same time considerable GIC with ~3 A was modelled, using observed dB\/dt values,\u00a0in the\u00a0natural gas pipeline situated at\u00a0M\u00e4nts\u00e4l\u00e4, Finland,\u00a0by the Finnish Meteorological Institute (FMI).<\/p>\n

\"GIC<\/a>
GIC in M\u00e4nst\u00e4l\u00e4 pipeline
\/source: FMI\/<\/figcaption><\/figure>\n

Accordingly, the consecutively arriving solar storms in the upcoming few days may cause power grid fluctuations, and our high-latitude region is especially vulnerable. Also, loss of GPS lock, issues\u00a0for amateur radio and GNSS operators may be observed.<\/p>\n","protected":false},"excerpt":{"rendered":"

Last week (starting with June 18) the Sun has launched consecutive solar storms and M-class flares. The shock front of first storm (originating from active region 2371) hit Earth yesterday, around 16.40 UT, with sudden jumps in all measured solar wind properties (Figure 1). This sudden impulse caused a sudden …<\/p>\n","protected":false},"author":505,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1075","post","type-post","status-publish","format-standard","hentry","category-uncategorized","column","threecol"],"_links":{"self":[{"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/posts\/1075","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/users\/505"}],"replies":[{"embeddable":true,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/comments?post=1075"}],"version-history":[{"count":6,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/posts\/1075\/revisions"}],"predecessor-version":[{"id":1084,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/posts\/1075\/revisions\/1084"}],"wp:attachment":[{"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/media?parent=1075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/categories?post=1075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.uit.no\/spaceweather\/wp-json\/wp\/v2\/tags?post=1075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}