{"id":10846,"date":"2026-05-21T13:00:17","date_gmt":"2026-05-21T04:00:17","guid":{"rendered":"https:\/\/www.arc.hokudai.ac.jp\/?p=10846"},"modified":"2026-05-21T13:20:56","modified_gmt":"2026-05-21T04:20:56","slug":"%e5%bd%93%e3%82%bb%e3%83%b3%e3%82%bf%e3%83%bc%e6%89%80%e5%b1%9e%e3%81%ae%e5%8c%97%e5%a4%a7%e5%a4%a7%e5%ad%a6%e9%99%a2%e7%92%b0%e5%a2%83%e7%a7%91%e5%ad%a6%e9%99%a2%e5%8d%9a%e5%a3%ab%e5%be%8c%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/www.arc.hokudai.ac.jp\/en\/archives\/10846","title":{"rendered":"Research findings by a group led by Tomohiro Nakayama, a first-year doctoral student in the Graduate School of Environmental Science at Hokkaido University and a member of our center, have been announced in a joint press release."},"content":{"rendered":"<p><\/p>\n<p>A research group led by Tomohiro Nakayama, a first-year doctoral student in the Graduate School of Environmental Science at Hokkaido University (at the time of the study: a second-year master\u2019s student), and Ryuho Kataoka, a principal researcher at the Okinawa Institute of Science and Technology Graduate University, conducted a study on five low-latitude auroras observed in northern Japan between 2024 and 2025, revealing that they occurred at higher altitudes than typical auroras.<\/p>\n<p>By utilizing photographic data collected from the public and combining it with future observations and modeling, we expect to shed light on the causes of high-altitude auroras and the mechanisms behind intense atmospheric heating in the thermosphere. This is expected to contribute to improving the accuracy of space weather forecasts, thereby helping to reduce the risk of unexpected atmospheric re-entry for low-Earth orbit satellites.<\/p>\n<blockquote>\n<p>For details, please refer to the joint press release issued by our university and the Okinawa Institute of Science and Technology Graduate University (OIST) below:<\/p>\n<p><a href=\"https:\/\/www.hokudai.ac.jp\/news\/2026\/05\/content-32.html\">https:\/\/www.hokudai.ac.jp\/news\/2026\/05\/content-32.html<\/a><\/p>\n<p>(Excerpt from the joint press release)<\/p>\n<p>Factors Contributing to Low-Latitude Aurora Activity During Small-Scale Magnetic Storms<\/p>\n<p>~ Expectations for elucidating the causes of low-latitude aurora activity through a continuous, high-density citizen science observation network ~<\/p>\n<p>Key Points<\/p>\n<p>\u30fbEven during relatively small-scale geomagnetic storms, auroras can be observed in northern Japan when the density of the solar wind is extremely high.<br \/>\u30fbCitizen science observations have revealed that during these events, the altitude of the auroras is higher than usual.<br \/>\u30fbThis is expected to improve our understanding of atmospheric heating during geomagnetic storms and enhance the accuracy of future space weather forecasts.<\/p>\n<p>Paper Information:<\/p>\n<p>Tomohiro M. Nakayama, Ryuho Kataoka (2026), Faint red auroras as seen from Japan associated with intense magnetospheric compression, Journal of Space Weather and Space Climate, <a href=\"https:\/\/doi.org\/10.1051\/swsc\/2026004\">https:\/\/doi.org\/10.1051\/swsc\/2026004<\/a><\/p>\n<\/blockquote>\n<p><\/p>","protected":false},"excerpt":{"rendered":"A research group led by Tomohiro Nakayama, a first-year doctoral student in the Graduate School of Environment [&hellip;]","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10846","post","type-post","status-publish","format-standard","hentry","category-nocategory"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/posts\/10846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/comments?post=10846"}],"version-history":[{"count":10,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/posts\/10846\/revisions"}],"predecessor-version":[{"id":10856,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/posts\/10846\/revisions\/10856"}],"wp:attachment":[{"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/media?parent=10846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/categories?post=10846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.arc.hokudai.ac.jp\/en\/wp-json\/wp\/v2\/tags?post=10846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}