{"id":16371,"date":"2026-01-20T16:03:18","date_gmt":"2026-01-20T10:33:18","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16371"},"modified":"2026-01-20T16:03:21","modified_gmt":"2026-01-20T10:33:21","slug":"how-does-the-crew-on-international-space-station-shelter-themselves-when-there-is-a-geomagnetic-storm","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/how-does-the-crew-on-international-space-station-shelter-themselves-when-there-is-a-geomagnetic-storm\/","title":{"rendered":"How does the crew on International Space Station shelter themselves when there is a geomagnetic storm?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/eeUuVkJgo_Q?si=ifuxLYVBsDZ1MdvP\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<p class=\"wp-block-paragraph\">We are currently experiencing a G4 Severe Geomagnetic storm resulting from a solar coronal mass ejection which occurred on 18 January 2026. Read that crew on the ISS had taken shelter to protect themselves during the ongoing geomagnetic storm. When a significant geomagnetic storm or solar particle event occurs, the crew of the International Space Station (ISS) follows a protocol designed to minimize their radiation exposure. While the Earth\u2019s magnetosphere provides a natural shield for the station, severe storms can cause &#8220;holes&#8221; or regions where radiation levels exceed safe baselines. The primary strategy is to move the crew to the most heavily shielded areas of the station, known as <strong>&#8220;safe havens.&#8221;<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Hardened Safe Havens<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The crew typically shelters in two specific modules that offer the highest density of protective material:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Zvezda Service Module (Russian Segment):<\/strong> This is the most frequently used shelter. During its construction, it was lined with <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/15644352\/\">specialized <strong>polyethylene<\/strong><\/a> (a hydrogen-rich plastic) shields. Hydrogen is exceptionally effective at slowing down and absorbing high-energy protons.<\/li>\n\n\n\n<li><strong>The US Lab (Destiny):<\/strong> This module is also considered a safe haven because it is located in the center of the station&#8217;s main cluster. Being surrounded by other modules provides &#8220;geometric shielding,&#8221; where the other station components act as extra layers of mass.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Utilizing &#8220;Water Walls&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Water is one of the best radiation shields available because of its high hydrogen content. The crew may be instructed to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Move <strong>water storage containers<\/strong> and <strong>food supplies<\/strong> to the walls of their sleeping quarters or the safe haven modules.<\/li>\n\n\n\n<li>By lining the walls with these dense, hydrogen-rich items, they create a temporary, thick &#8220;shield&#8221; that significantly reduces the amount of radiation reaching their bodies.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Personal Protection (AstroRad Vests)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In recent years, NASA has tested specialized wearable technology like the <strong><a href=\"https:\/\/issnationallab.org\/case_study\/wearable-radiation-shielding-astrorad-vest\/\">AstroRad vest<\/a><\/strong>. These are selective shielding vests designed to protect the most radiation-sensitive organs (like bone marrow and the gastrointestinal tract) while allowing astronauts to remain somewhat mobile if they need to perform essential tasks during a storm. These vests use high-density polymers. They are often described as &#8220;gravity blankets&#8221; and can be worn even while inside a safe haven for double protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Operational Protocols<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The ground-based <strong>Space Radiation Analysis Group (SRAG)<\/strong> at Mission Control monitors solar activity 24\/7. When a storm is detected:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>EVA Suspension:<\/strong> All spacewalks (EVAs) are immediately canceled or terminated. An astronaut in a spacesuit has almost no protection compared to someone inside the station.<\/li>\n\n\n\n<li><strong>Sleep Relocation:<\/strong> If a storm is expected to last through the &#8220;night,&#8221; the crew may be ordered to sleep in the more protected modules rather than their individual crew quarters.<\/li>\n\n\n\n<li><strong>Orbital Avoidance:<\/strong> Ground teams monitor the station&#8217;s position relative to the <strong>South Atlantic Anomaly (SAA)<\/strong> and the polar regions, where radiation is highest. The crew may be told to avoid certain &#8220;thinly shielded&#8221; modules (like the Cupola or the Node 3 gym) when passing through these high-risk zones.<\/li>\n\n\n\n<li><strong>Real-time Monitoring:<\/strong> Crew members wear <strong>Active Dosimeters<\/strong> that provide real-time data via Bluetooth to Mission Control, allowing doctors to track each astronaut&#8217;s <a href=\"https:\/\/srag.jsc.nasa.gov\/spaceradiation\/how\/how.cfm\">cumulative dose<\/a> throughout the storm. While a typical day on the ISS might expose an astronaut to about 0.5 to 1 mSv of radiation (roughly equivalent to 50\u2013100 chest X-rays), severe storms <strong>like the one which we are having now<\/strong>, can spike those levels significantly within hours. Astronauts are currently witnessing some of the most spectacular auroras ever recorded from orbit, as the &#8220;auroral oval&#8221; has expanded significantly toward the equator.<\/li>\n\n\n\n<li><strong>Altitude Maneuvers:<\/strong> While rare, mission control can sometimes adjust the station&#8217;s orientation to ensure the most shielded parts of the station are facing the direction of the incoming particle flux.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Summary of Shielding Materials<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Material<\/strong><\/td><td><strong>Why it is used<\/strong><\/td><td><strong>Effectiveness<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Polyethylene<\/strong><\/td><td>High hydrogen density; light for launch.<\/td><td>Very High (Standard in Zvezda)<\/td><\/tr><tr><td><strong>Water\/Food<\/strong><\/td><td>Dual-purpose; high hydrogen content.<\/td><td>High (Used for &#8220;Water Walls&#8221;)<\/td><\/tr><tr><td><strong>Aluminum<\/strong><\/td><td>Primary hull material.<\/td><td>Low (Provides basic structure but can create secondary radiation)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We are currently experiencing a G4 Severe Geomagnetic storm resulting from a solar coronal mass ejection which occurred on 18 January 2026. Read that crew on the ISS had taken shelter to protect themselves during the ongoing geomagnetic storm. When a significant geomagnetic storm or solar particle event occurs, the crew of the International Space [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16378,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How does the crew on International Space Station shelter themselves when there is a geomagnetic storm? - Johnson&#039;s Techworld<\/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:\/\/johnsonfrancis.org\/techworld\/how-does-the-crew-on-international-space-station-shelter-themselves-when-there-is-a-geomagnetic-storm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How does the crew on International Space Station shelter themselves when there is a geomagnetic storm? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"We are currently experiencing a G4 Severe Geomagnetic storm resulting from a solar coronal mass ejection which occurred on 18 January 2026. 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