Signature of white bubbles in the equatorial ionosphere

Signature of white bubbles in the equatorial ionosphere | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Signature of white bubbles in the equatorial ionosphere Hisao Takahashi, Cosme A.O.B. Figueiredo, Cristiano M Wrasse, and 9 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4421438/v2 This work is licensed under a CC BY 4.0 License Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Abstract From airglow OI 630 nm observations in the low-latitude ionosphere, we identified an enhancement in the emission rate inside Equatorial Plasma Bubbles (EPBs) on certain occasions after local midnight during equinox seasons. On the night of 7–8 October 2021, an all-sky imager, operated at Bom Jesus da Lapa (BJL) (13.3°S, 43.5°W, dip 14.1°S), observed a dark plasma bubble transitioning into a bright one due to an enhancement of the OI 630 nm emission rate, a phenomenon we refer to as a "White Bubble" (WhB). Prior to the appearance of the WhB, the imager detected a Midnight Brightness Wave (MBW) rapidly moving southward from the equator. Concurrently, a downward movement of the F-layer's height was observed at Cachoeira Paulista (22.7°S, 45.0°W, dip 18.1°S). The WhB extended equatorward when the EPB's eastward drift speed increased. Similar WhBs were observed on seven nights during 2021–2022. These observations suggest that the MBW interacted with the EPB, causing plasma depletion within the EPB to be filled, ultimately generating a WhB. Equatorial Plasma Bubbles (EPBs) White Bubbles (WhBs) Midnight OI 630 nm Brightness Wave (MBW) Midnight Temperature Maximum (MTM). Full Text Supplementary Files GraphicAbstractTaka.png Cite Share Download PDF Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4421438","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":431575185,"identity":"762b0cc6-8bf5-474b-948a-9baa9efedcdc","order_by":0,"name":"Hisao Takahashi","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA/ElEQVRIiWNgGAWjYBACA2YoQ4KBh4GBsUFCjg3EY2wgqMUArsWYsBYGVC0MiQ2EtJizsz/88IHhj7xk+9mDH3/usEjvk+49+IBxxz2cWiybeYwlZzAYGM7myUuW5j0jkdsmcy7ZgPFMMW6HHeZhkOZhMGCcx5BjIM3YBtQikWMmwdiWgEcL++PfQC328/jfGP/82SaRziaRY/4DvxYGM5AtibNBhvO2SSQAtZgx4NfCY2Y5w8A4eeaMN2bWQC2GbRJ5yRKJZ/BoOX/88Y0PFXK2M87nGN/82VYnLz8j9+CHjztwa4FqROEBI4iQBnTAQ6L6UTAKRsEoGO4AAOhkS9LIFVAUAAAAAElFTkSuQmCC","orcid":"https://orcid.org/0000-0002-8844-8920","institution":"Instituto Nacional de Pesquisas Espaciais","correspondingAuthor":true,"prefix":"","firstName":"Hisao","middleName":"","lastName":"Takahashi","suffix":""},{"id":431575186,"identity":"f09d8d96-71d4-4608-898b-2fafbca5e6b1","order_by":1,"name":"Cosme A.O.B. 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