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The universe looks very impressive when visualized with an X-ray machine. More importantly, X-ray images provide important scientific insights by revealing features of the universe that cannot be observed in visible light. The same is true for our solar system, but this has been difficult because of the challenge of separating local emissions from the rest of the Milky Way. In a recent study, a team at the Max Planck Institute for Extraterrestrial Physics (MPE) was the first to successfully unleash the solar system’s X-ray glow from deep space. <\/p>\n
It is based on data obtained from an extended Roentgen survey using the Imaging Telescope Array (eROSITA), an instrument on board the Russian-German Spectral Roentgen Gamma (SRG) Observatory, from 2019 to 2021. The four sky maps created from this enabled the extraction of solar wind charge exchange (SWCX) emissions from the cosmic background, providing the clearest view of the solar system’s soft X-ray glow. Until today. <\/p>\n
Soft X-ray glow occurs when highly charged solar wind ions (such as carbon and oxygen) capture electrons from neutral atoms in Earth’s upper atmosphere (geocorona) and elsewhere in the heliosphere. Based on data collected between 2019 and 2021. Previously, scientists believed that SWCX was simply signal interference, as it affects all studies of the X-ray sky, distorting temperature and density measurements. These are essential to cosmological models, and new data will be essential to understanding how the universe has evolved over billions of years. <\/p>\n
Illustration of the separation of the SWCX foreground radiation from the cosmic X-ray sky of the Western Galactic Hemisphere. Credit: K. Dennerl (MPE)<\/em><\/p>\n The SRG\/eROSITA telescope has made this possible due to the telescope’s unique location (around the L2 Lagrangian point), which avoids X-ray interference from Earth’s geocorona. Being able to conduct long-term observations beyond solar minimum also allowed researchers to track changes in X-ray levels due to solar activity. By comparing observations, the research team isolated the components of the heliosphere and reconstructed the soft X-ray sky visible from outside the solar system. <\/p>\n It will also be possible (for the first time) to study the heavy ion content of the solar wind, its variability, and its interaction with the interstellar medium (ISM). The data also revealed the evolution of X-ray emissions, with observable changes occurring at different latitudes as solar activity increases. This confirms previous studies showing a decrease in X-ray radiation around the sun’s polar regions during solar minimum, a phenomenon known as a “polar hole” that closes as activity increases. <\/p>\n Further analysis of the data revealed that X-ray emissions were enhanced in localized regions near Earth’s orbit that are not orbiting the sun. This is the result of “interstellar winds,” which are helium atoms that pass through our solar system as they pass through the Milky Way. This confirmed another prediction dating back to the 1970s that the Sun’s gravity would form a “helium focusing cone.” Essentially, the sun’s gravity bends the orbits of these atoms, creating a concentrated flow on the “downwind” side. <\/p>\n By combining solar wind measurements with data on the distribution of matter within the ISM, the researchers created a time-resolved three-dimensional model of SWCX emission. This reveals that the ejection primarily originates from a spiral structure driven by changes in solar wind speed within Mars’ orbit, with a clear cone (averaged over time). These discoveries represent a paradigm shift in soft X-ray astronomy, turning what was considered a contamination nuisance into a powerful diagnostic tool. Team leader Konrad Dennerl said in an MPE press release:<\/p>\n Tracking how the solar wind changes the appearance of the X-ray sky over time not only allows us to pinpoint observations of the distant universe, but also provides unprecedented insight into solar physics and the dynamics of the heliosphere. Understanding the solar system’s X-ray emission is key to properly interpreting observations of the diffuse X-ray sky.<\/p>\n<\/blockquote>\n The paper describing their findings, “Determining the Solar System’s Contribution to the Soft X-ray Sky,” was recently published in the journal Science.<\/em><\/p>\n More information: MPE<\/em><\/p>\n<\/p><\/div>\n #Behold #solar #system #Xray #glory<\/p>\n","protected":false},"excerpt":{"rendered":" The universe looks very impressive when visualized with an X-ray machine. More importantly, X-ray images provide important scientific insights by revealing features of the universe that cannot be observed in visible light. The same is true for our solar system, but this has been difficult because of the challenge of separating local emissions from the … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":820,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[1913,1915,921,922,1914],"class_list":["post-819","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-behold","tag-glory","tag-solar","tag-system","tag-xray"],"_links":{"self":[{"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/posts\/819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hyokal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=819"}],"version-history":[{"count":0,"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/posts\/819\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hyokal.com\/index.php?rest_route=\/wp\/v2\/media\/820"}],"wp:attachment":[{"href":"https:\/\/hyokal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hyokal.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=819"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hyokal.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n