Solar Radiation and Geomagnetic Contribution of Consecutive 27-Day Recurrent Geomagnetic Storms to Variations of Equatorial Ionospheric Parameters and Spread F

Solar Radiation and Geomagnetic Contribution of Consecutive 27-Day Recurrent Geomagnetic Storms to Variations of Equatorial Ionospheric Parameters and Spread F | 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 Solar Radiation and Geomagnetic Contribution of Consecutive 27-Day Recurrent Geomagnetic Storms to Variations of Equatorial Ionospheric Parameters and Spread F THANA YEERAM This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3958155/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 7 You are reading this latest preprint version Abstract This study investigates solar radiation and geomagnetic effects of consecutive 27-day recurrent geomagnetic storms (RGSs) during 2007 on the variabilities in the equatorial ionospheric F-region in American Peruvian sector. Results show correspondence of quasi-periodic variations between geomagnetic activities and ionospheric responses in the F-region. In High-Intensity Long-Duration Continuous ( AE ) Activity (HILDCAA) events, the ionospheric responses are more variable than in non-HILDCAA. The critical frequency and peak heights of the F-layer tend to increase during storm-time in summer months, but decrease in response to enhanced equatorial electrojets. A new classification of daily variations in the virtual height of the F-layer ( h′F ) is proposed: (mode A) mixing of great height before noon and low height before midnight, (mode B) moderate height before midnight, and (mode C) mixing of low height before noon and great height before midnight. These ( h′F ) modes efficiently characterize ionospheric variabilities and processes. The great uplifts of ( h′F ) during night-time coincide with the presence of strong disturbance dynamo electric fields and disturbed neutral winds generated by intensified Joule heating in the summer months. The solar EUV plays a role in the uplifts during daytime. Zonal electric field disturbances and perturbations in neutral meridional winds critically contribute to the equatorial ionospheric responses and ESF variability. Most of inhibited/suppressed ESF occurred in mode A and in overshielding conditions. The inhibited ESF in the recovery phase is mainly contributed by a cooling state after great uplifts by daytime thermospheric winds. Recurrent geomagnetic storm Equatorial ionosphere High speed solar wind spread F Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 26 Mar, 2024 Reviews received at journal 08 Mar, 2024 Reviewers agreed at journal 27 Feb, 2024 Reviewers invited by journal 18 Feb, 2024 Editor assigned by journal 18 Feb, 2024 Submission checks completed at journal 15 Feb, 2024 First submitted to journal 15 Feb, 2024 You are reading this latest preprint version 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. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-3958155","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":273563125,"identity":"c13a9e8a-8243-4542-92aa-d9edeed3eb6e","order_by":0,"name":"THANA YEERAM","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAwUlEQVRIiWNgGAWjYDACCQglBxcwIKSDB6rFGG4E0VoSG4jWYi/d/OzBD4bD6Wv7zxgw/KhhqDMnaIvMMXPDHobDudtu5Bgw9hxjkLBsIKRFIsFMggeshceAgbcB6LADBLWkf5P8A3SY2fkzBox/idOSYyYNtCXB7ECOATNxttzIKZOWMUg33HYjreCwzDEJyQ2EtLDPSN8m+abCWt7s/OGND9/U2PATtAUCDJrB1AF4YiAC1BGtchSMglEwCkYgAAA/bznPuB6XOQAAAABJRU5ErkJggg==","orcid":"","institution":"Mahasarakham University","correspondingAuthor":true,"prefix":"","firstName":"THANA","middleName":"","lastName":"YEERAM","suffix":""}],"badges":[],"createdAt":"2024-02-15 08:59:31","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-3958155/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-3958155/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":51293433,"identity":"cf04a23f-814e-48ce-8644-2f2fd7985066","added_by":"auto","created_at":"2024-02-19 02:45:20","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1447019,"visible":true,"origin":"","legend":"","description":"","filename":"YeeramAstroSpacescience2024.pdf","url":"https://assets-eu.researchsquare.com/files/rs-3958155/v1_covered_04f5bac6-e07e-45cd-81fb-53f0a9d42343.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Solar Radiation and Geomagnetic Contribution of Consecutive 27-Day Recurrent Geomagnetic Storms to Variations of Equatorial Ionospheric Parameters and Spread F","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"astrophysics-and-space-science","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"astr","sideBox":"Learn more about [Astrophysics and Space Science](https://www.springer.com/journal/10509)","snPcode":"10509","submissionUrl":"https://submission.nature.com/new-submission/10509/3","title":"Astrophysics and Space Science","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Recurrent geomagnetic storm, Equatorial ionosphere, High speed solar wind, spread F","lastPublishedDoi":"10.21203/rs.3.rs-3958155/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-3958155/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThis study investigates solar radiation and geomagnetic effects of consecutive 27-day recurrent geomagnetic storms (RGSs) during 2007 on the variabilities in the equatorial ionospheric F-region in American Peruvian sector. Results show correspondence of quasi-periodic variations between geomagnetic activities and ionospheric responses in the F-region. In High-Intensity Long-Duration Continuous (\u003cem\u003eAE\u003c/em\u003e) Activity (HILDCAA) events, the ionospheric responses are more variable than in non-HILDCAA. The critical frequency and peak heights of the F-layer tend to increase during storm-time in summer months, but decrease in response to enhanced equatorial electrojets. A new classification of daily variations in the virtual height of the F-layer (\u003cem\u003eh′F\u003c/em\u003e) is proposed: (mode A) mixing of great height before noon and low height before midnight, (mode B) moderate height before midnight, and (mode C) mixing of low height before noon and great height before midnight. These (\u003cem\u003eh′F\u003c/em\u003e) modes efficiently characterize ionospheric variabilities and processes. 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