{"id":377894,"date":"2025-05-10T14:54:33","date_gmt":"2025-05-10T12:54:33","guid":{"rendered":"https:\/\/climatescience.press\/?p=377894"},"modified":"2025-05-10T14:54:35","modified_gmt":"2025-05-10T12:54:35","slug":"the-suns-little-known-100-year-gleissberg-cycle-is-waking-up","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=377894","title":{"rendered":"The Sun\u2019s Little-Known 100-year \u201cGleissberg Cycle\u201d is Waking Up"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

From Watts Up With That?<\/a><\/p>\n\n\n\n

By Anthony Watts<\/a><\/p>\n\n\n\n

Via\u00a0SpaceWeather.com<\/a>\u00a0You\u2019ve heard of the 11-year sunspot cycle. But what about the Centennial Gleissberg Cycle? The Gleissberg Cycle is a slower 100-year modulation of sunspots. New research just published in the journal\u00a0Space Weather<\/em>\u00a0suggests that the Gleissberg Cycle is waking up again, which could make solar cycles for the next 50 years increasingly intense.<\/p>\n\n\n

\n
\"\"
The black line traces the Centennial Gleissberg Cycle, which modulates the 11-year sunspot cycle.<\/figcaption><\/figure>\n<\/div>\n\n\n

You\u2019ve probably heard of the 11-year sunspot cycle. The Gleissberg Cycle is a slower modulation, which suppresses sunspot numbers every 80 to 100 years. For the past ~15 years, the sun has been near a low point in this cycle, but this is about to change.<\/p>\n\n\n\n

New research<\/a> published in the journal Space Weather<\/em> suggests that the Gleissberg Cycle is waking up again. If this is true, solar cycles for the next 50 years could become increasingly intense.<\/p>\n\n\n\n

\u201cWe have been looking at protons in the South Atlantic Anomaly,\u201d explains the paper\u2019s lead author Kalvyn Adams, an astrophysics student at the University of Colorado. \u201cThese are particles from the sun that come unusually close to Earth because our planet\u2019s magnetic shield is weak over the south Atlantic Ocean.\u201d<\/p>\n\n\n

\n
\"\"
Above:\u00a0<\/strong>The South Atlantic Anomaly (blue) is a weak spot in Earth\u2019s magnetic field where particles from the sun can come relatively close to Earth [more<\/a>]<\/figcaption><\/figure>\n<\/div>\n\n\n

It turns out that protons in the South Atlantic Anomaly are a \u201ccanary in a coal mine<\/a>\u201d for the Gleissberg Cycle. When these protons decrease, it means the Gleissberg Cycle is about to surge. \u201cThat\u2019s exactly what we found,\u201d says Adams. \u201cThe protons are clearly decreasing in measurements we obtained from NOAA\u2019s Polar Operational Environmental Satellites.\u201d<\/p>\n\n\n\n

Protons in the South Atlantic Anomaly are just the latest in a growing body of evidence suggesting that the \u201cGleissberg Minimum\u201d has passed. Current sunspot counts are up; the sun\u2019s ultraviolet output has increased; and the overall level of solar activity in Solar Cycle 25 has exceeded forecasts. It all adds up to an upswing in the 100-year cycle.<\/p>\n\n\n\n

<\/a>It also means that Joan Feyman<\/a> was right. Before she passed away in 2020, the pioneering solar physicist was a leading researcher of the Gleissberg Cycle, and she firmly believed that the centennial oscillation was responsible for the remarkable weakness of Solar Cycle 24 (2012-2013). In a seminal paper<\/a> published in 2014, she argued that the minimum of the Gleissberg Cycle fell almost squarely on top of Solar Cycle 24, making it the weakest cycle in 100 years. The tide was about to turn.<\/p>\n\n\n\n

The resurgence of the Gleissberg Cycle makes a clear prediction for the future: Solar Cycles 26 through 28 should be progressively intense. Solar Cycle 26, peaking in ~2036, would be stronger than current Solar Cycle 25, and so on. The projected maximum of the Gleissberg Cycle is around 2055, aligning more or less with Solar Cycle 28. That cycle could be quite intense.<\/p>\n\n\n\n

\u201cWith a major increase in launch rates, it\u2019ll be important to plan for changes to the space environment that thousands of satellites and spacecraft are flying through from all sides,\u201d says Adams. \u201cSolar activity and particle fluxes could all be very different in the decades ahead.\u201d<\/p>\n\n\n\n

For more information, read Adams\u2019s original research here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Via\u00a0SpaceWeather.com\u00a0You\u2019ve heard of the 11-year sunspot cycle. But what about the Centennial Gleissberg Cycle? The Gleissberg Cycle is a slower 100-year modulation of sunspots. New research just published in the journal\u00a0Space Weather\u00a0suggests that the Gleissberg Cycle is waking up again, which could make solar cycles for the next 50 years increasingly intense.<\/p>\n","protected":false},"author":121246920,"featured_media":377901,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691834975,691834971,691834974,691824755,691834973,691834972],"class_list":{"0":"post-377894","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-current-solar-cycle-25","9":"tag-gleissberg-cycle","10":"tag-protons","11":"tag-solar-cycles","12":"tag-south-atlantic-anomaly","13":"tag-space-weather","15":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/05\/0solarflares.jpg?fit=1920%2C1080&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1Aj4","jetpack-related-posts":[{"id":254638,"url":"https:\/\/climatescience.press\/?p=254638","url_meta":{"origin":377894,"position":0},"title":"Jupiter, Earth and Venus\u2018 tropical alignments point to the mean solar cycle length","author":"uwe.roland.gross","date":"25\/04\/2023","format":false,"excerpt":"The Earth\u2019s axial precession doesn\u2019t drive the orbit period of major solar system bodies such as Jupiter and Venus. 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