{"id":457358,"date":"2026-07-23T11:30:44","date_gmt":"2026-07-23T18:30:44","guid":{"rendered":"https:\/\/climatescience.press\/?p=457358"},"modified":"2026-07-23T11:30:46","modified_gmt":"2026-07-23T18:30:46","slug":"controversial-danish-physicist-henrik-svensmark-fired-by-dtu-after-decades-of-cosmic-ray-climate-research","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=457358","title":{"rendered":"Controversial Danish Physicist Henrik Svensmark Fired by DTU After Decades of Cosmic Ray Climate Research"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Henrik Svensmark, a Danish physicist and senior researcher at DTU Space (Danish National Space Institute), is known for his work on the effects of cosmic rays on cloud formation and their potential influence on climate. He has been at DTU (or its predecessors) since the late 1990s and led the Center for Sun-Climate Research.<\/p>\n\n\n\n

Svensmark’s statement:<\/strong> <\/p>\n\n\n\n

He described the dismissal as a \u201cgood old-fashioned firing\u201d and a \u201cdeath blow\u201d to his research program. He noted years of internal conflicts, including a blocked promotion to full professor around 2016 despite positive evaluations, funding difficulties, and a prior dismissal attempt in 2021 (which was reportedly paused after protests from international scientists). He does not rule out political considerations.<\/p>\n\n\n\n

DTU’s position:<\/strong> <\/p>\n\n\n\n

The university has treated it as a personnel matter and declined detailed comment. DTU Space director Henning Skriver stated that atmospheric physics (Svensmark\u2019s area) is being \u201csignificantly down-prioritized\u201d as part of strategic changes. Svensmark was 68 at the time and still actively planning new experiments.<\/p>\n\n\n\n

Coverage:<\/strong> <\/p>\n\n\n\n

A detailed interview appeared in the Danish newspaper Berlingske. The story has been picked up by Clintel and Watts Up With That, which frame it as suppression of dissenting research. Mainstream or critical sources note his work as controversial.<\/p>\n\n\n\n

Background on Svensmark<\/strong><\/p>\n\n\n\n

His research proposes that variations in cosmic ray flux (modulated by solar activity) influence atmospheric ionization, aerosol formation, cloud cover, and thus climate. This challenges aspects of dominant CO\u2082-centric models by emphasizing natural variability. His papers have significant citations (h-index around 30, over 7,000 citations), but the work remains debated and often criticized by mainstream climate scientists for the strength of its climate impact claims.<\/p>\n\n\n\n

This case has sparked discussion about academic freedom, institutional priorities, and whether the decision reflects scientific evaluation or conformity pressures. DTU has not publicly provided a detailed scientific rationale beyond reprioritization.<\/p>\n\n\n\n

\"\"
Controversial Danish climate and space researcher has been fired by DTU: It’s “a death blow” to my research | International | Society | Berlingske<\/a><\/figcaption><\/figure>\n\n\n\n

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

\"\"
Henrik Svensmark’s research must not be fired with him | Klimarealisme.dk<\/a><\/figcaption><\/figure>\n\n\n\n

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

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

Svensmark’s cosmic ray cloud hypothesis<\/strong><\/p>\n\n\n\n

Svensmark’s cosmic ray-cloud hypothesis<\/strong> (often called “cosmoclimatology”) proposes that galactic cosmic rays (GCRs) \u2014 high-energy particles from outside the solar system \u2014 influence Earth’s climate by affecting cloud formation. Variations in solar activity modulate the flux of these rays reaching the atmosphere, providing a natural mechanism for climate variability on various timescales.<\/p>\n\n\n\n

Core Mechanism<\/strong><\/p>\n\n\n\n

    \n
  1. Solar modulation of cosmic rays: <\/strong>The Sun’s magnetic field and solar wind strengthen during high solar activity (e.g., more sunspots), deflecting more GCRs away from Earth. During low solar activity, more cosmic rays penetrate the atmosphere. <\/li>\n\n\n\n
  2. Ionization and aerosol formation:<\/strong> Cosmic rays ionize air molecules, producing ions and free electrons. These charged particles help cluster molecules (e.g., involving sulfuric acid, water, ammonia, or organics) into small aerosols (nanometer-scale particles). Some aerosols grow into cloud condensation nuclei (CCN, typically >50\u2013100 nm), on which water vapor condenses to form cloud droplets. <\/li>\n\n\n\n
  3. Cloud and climate effects: <\/strong>More cosmic rays \u2192 more ionization \u2192 more CCN \u2192 more (or denser) low-level clouds \u2192 higher albedo (reflectivity) \u2192 cooling. Fewer cosmic rays (stronger solar activity) \u2192 fewer clouds \u2192 more solar energy absorbed \u2192 warming. Low clouds are particularly important as they have a strong net cooling effect. <\/li>\n<\/ol>\n\n\n\n

    Svensmark argues this explains a significant portion of climate changes, including 20th-century warming (as solar activity was relatively high and cosmic rays lower), and longer-term variations, while not denying a role for CO\u2082 but suggesting solar\/cosmic influences are larger than often assumed.<\/p>\n\n\n\n

    Supporting Evidence<\/strong><\/p>\n\n\n\n

    Observational correlations:<\/strong> <\/p>\n\n\n\n

    Svensmark and colleagues (e.g., with Eigil Friis-Christensen) reported links between cosmic ray flux and cloud cover\/low-level clouds on decadal scales, and responses to Forbush decreases (sudden drops in cosmic rays from solar events). For example, a 2009 study found declines in marine liquid water clouds and fine aerosols tracking cosmic ray reductions.<\/p>\n\n\n\n

    Laboratory experiments:<\/strong><\/p>\n\n\n\n

      \n
    • SKY experiment (Danish National Space Institute):<\/strong> Used natural muons (from cosmic rays) and showed ionization promotes molecular clusters that can grow into CCN with UV light, trace gases, etc. Follow-up work (e.g., 2013, 2017) claimed aerosols >50 nm form and respond to ions. <\/li>\n\n\n\n
    • CLOUD at CERN:<\/strong> Built partly to test this. It confirmed ions can enhance nucleation (especially with sulfuric acid, ammonia, amines, or biogenic organics), but results showed complex chemistry involving multiple vapors.<\/li>\n<\/ul>\n\n\n\n

      Longer timescales<\/strong>: <\/p>\n\n\n\n

      Links proposed to paleoclimate, ice ages, and even biodiversity via supernova rates and cosmic ray variations over millions of years.<\/p>\n\n\n\n

      Criticisms and Counter-Evidence<\/strong><\/p>\n\n\n\n

      CLOUD results on magnitude:<\/strong> <\/p>\n\n\n\n

      While ionization aids nucleation, the effect on CCN concentrations is weak. Growth to CCN sizes competes with coagulation losses, and other vapors (anthropogenic and biogenic) dominate. A 2017 analysis of CLOUD data concluded the ion-aerosol mechanism is “too weak to significantly impact clouds and climate.”<\/p>\n\n\n\n

      Observational issues:<\/strong> <\/p>\n\n\n\n

      Many studies find weak or no robust global correlation between cosmic rays and cloud cover after accounting for El Ni\u00f1o, volcanoes, etc. Satellite data often link cloud changes more to ENSO or other factors. No significant GCR trend explains recent decades of warming.<\/p>\n\n\n\n

      Alternative explanations and modeling:<\/strong> <\/p>\n\n\n\n

      Cloud responses to CCN are sublinear; nucleation occurs without ions (though slower); and global models incorporating CLOUD findings show limited GCR influence. Critics argue correlations were sometimes overstated or data-handled selectively.<\/p>\n\n\n\n

      Consensus view:<\/strong> <\/p>\n\n\n\n

      The hypothesis is not widely accepted as a major driver of modern climate change. It may play a role in pre-industrial variability or regionally, but greenhouse gases dominate recent warming according to mainstream assessments.<\/p>\n\n\n\n

      Current Status<\/strong><\/p>\n\n\n\n

      Svensmark continues publishing on solar influences and has explored extensions (e.g., to evolution and deep time). <\/p>\n\n\n\n

      The hypothesis spurred valuable research (like CLOUD, which advanced aerosol science broadly), but the climate impact appears smaller than originally proposed. <\/p>\n\n\n\n

      Uncertainties remain in exact nucleation chemistry, regional effects, and long-term paleoclimate links.<\/p>\n\n\n\n

      In summary, it’s an elegant physical mechanism with some experimental and correlational support, but quantitative assessments (especially post-CLOUD) indicate it is not strong enough to be a primary driver compared to other forcings. <\/p>\n\n\n\n

      It highlights the importance of clouds and natural variability in climate science.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

      Henrik Svensmark, a Danish physicist and senior researcher at DTU Space (Danish National Space Institute), is known for his work on the effects of cosmic rays on cloud formation and their potential influence on climate. He has been at DTU (or its predecessors) since the late 1990s and led the Center for Sun-Climate Research.<\/p>\n","protected":false},"author":121246920,"featured_media":457360,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Henrik Svensmark, a Danish physicist and senior researcher at DTU Space (Danish National Space Institute), is known for his work on the effects of cosmic rays on cloud formation and their potential influence on climate. He has been at DTU (or its predecessors) since the late 1990s and led the Center for Sun-Climate Research.","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"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":[691829939,691844218,691844217,691838173,691844216,691844215],"class_list":["post-457358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-atmospheric-physics","tag-cosmic-ray-cloud-hypothesis","tag-danish-newspaper-berlingske","tag-dr-henrik-svensmark","tag-dtu-space-director-henning-skriver","tag-technical-university-of-denmark-dtu","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-1UYK","jetpack-related-posts":[{"id":403556,"url":"https:\/\/climatescience.press\/?p=403556","url_meta":{"origin":457358,"position":0},"title":"Sun and Cosmic Rays Drive Climate, Not CO2, Says Astrophysicist","author":"uwe.roland.gross","date":"09\/20\/2025","format":false,"excerpt":"\u201cClimate science is not normal science,\u201d Danish astrophysicist Dr Henrik Svensmark says. \u201cIt's a bad career move to go against the idea that CO2 is the only driver of climate change,\u201d he notes. In other words, to say that important causes of climate change might lie elsewhere means losing your\u2026","rel":"","context":"In \"astrophysicist Nir Shaviv\"","block_context":{"text":"astrophysicist Nir Shaviv","link":"https:\/\/climatescience.press\/?tag=astrophysicist-nir-shaviv"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQNQjjXjEchEt8PH6BUA5CzyQwvjuBh7BLKw7e3mxeI-BXCg02t4Ebxu13GaLV187gsAp8zLOY0pbktHwuik-A3hoo0xvh-w-V_BGN7WwCd_0T56WyFGWRjqdXhlEC_5cLfZQS7JnW5ZVPo0oLrFO2IREMsXlA.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQNQjjXjEchEt8PH6BUA5CzyQwvjuBh7BLKw7e3mxeI-BXCg02t4Ebxu13GaLV187gsAp8zLOY0pbktHwuik-A3hoo0xvh-w-V_BGN7WwCd_0T56WyFGWRjqdXhlEC_5cLfZQS7JnW5ZVPo0oLrFO2IREMsXlA.jpeg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQNQjjXjEchEt8PH6BUA5CzyQwvjuBh7BLKw7e3mxeI-BXCg02t4Ebxu13GaLV187gsAp8zLOY0pbktHwuik-A3hoo0xvh-w-V_BGN7WwCd_0T56WyFGWRjqdXhlEC_5cLfZQS7JnW5ZVPo0oLrFO2IREMsXlA.jpeg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQNQjjXjEchEt8PH6BUA5CzyQwvjuBh7BLKw7e3mxeI-BXCg02t4Ebxu13GaLV187gsAp8zLOY0pbktHwuik-A3hoo0xvh-w-V_BGN7WwCd_0T56WyFGWRjqdXhlEC_5cLfZQS7JnW5ZVPo0oLrFO2IREMsXlA.jpeg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2025\/09\/AQNQjjXjEchEt8PH6BUA5CzyQwvjuBh7BLKw7e3mxeI-BXCg02t4Ebxu13GaLV187gsAp8zLOY0pbktHwuik-A3hoo0xvh-w-V_BGN7WwCd_0T56WyFGWRjqdXhlEC_5cLfZQS7JnW5ZVPo0oLrFO2IREMsXlA.jpeg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":247719,"url":"https:\/\/climatescience.press\/?p=247719","url_meta":{"origin":457358,"position":1},"title":"The BBC used to cover both sides of the climate debate. 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It\u2019s much less I mean, the climate disasters and so on, I mean, they\u2019re not really increasing at all. 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