{"id":466,"date":"2017-11-16T13:32:49","date_gmt":"2017-11-16T13:32:49","guid":{"rendered":"https:\/\/research.reading.ac.uk\/met-spate\/?p=466"},"modified":"2017-11-16T14:13:25","modified_gmt":"2017-11-16T14:13:25","slug":"how-much-magnetic-flux-does-the-heliosphere-contain","status":"publish","type":"post","link":"https:\/\/research.reading.ac.uk\/met-spate\/how-much-magnetic-flux-does-the-heliosphere-contain\/","title":{"rendered":"How much magnetic flux does the heliosphere contain?"},"content":{"rendered":"

There is no direct means to measure the amount of magnetic flux dragged out from the corona by the solar wind to form the \u201copen\u201d solar flux (OSF) component which forms the heliosphere.\u00a0 If we start at the photosphere and work upwards, the estimate of OSF is strongly technique dependent. If we start with in situ spacecraft data, there are ambiguities about the amount of twisting up of magnetic flux, which means that the resulting OSF estimate varies with the time resolution of the data used. In a new study published in JGR (http:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/2017JA024631\/full<\/a>), we show how suprathermal electron observations can be used to unambiguously determine the open flux from in situ observations.\u00a0 There was an approximately factor 2 variation in the flux content of the heliosphere from the solar maximum of cycle 23 to the subsequent solar minimum.<\/p>\n

\"OSF
Figure 1. OSF estimates from in situ spacecraft data using a range of methods. The dashed and solid red lines show the upper and lower bounds and best estimate, respectively, of OSF obtained using suprathermal electron data.<\/em><\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

There is no direct means to measure the amount of magnetic flux dragged out from the corona by the solar wind to form the \u201copen\u201d solar flux (OSF) component which forms the heliosphere.\u00a0 If we start at the photosphere and work upwards, the estimate of OSF is strongly technique dependent. If we start with in<\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"__cvm_playback_settings":[],"__cvm_video_id":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[5,7],"tags":[15,17,16],"class_list":["post-466","post","type-post","status-publish","format-standard","hentry","category-highlights","category-publication","tag-heliosphere","tag-open-solar-flux","tag-solar-cycle"],"acf":[],"yoast_head":"\nHow much magnetic flux does the heliosphere contain? - SPATE<\/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:\/\/research.reading.ac.uk\/met-spate\/how-much-magnetic-flux-does-the-heliosphere-contain\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How much magnetic flux does the heliosphere contain? - SPATE\" \/>\n<meta property=\"og:description\" content=\"There is no direct means to measure the amount of magnetic flux dragged out from the corona by the solar wind to form the \u201copen\u201d solar flux (OSF) component which forms the heliosphere.\u00a0 If we start at the photosphere and work upwards, the estimate of OSF is strongly technique dependent. 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