{"title":"A Method for Estimating the Spatial Period of Energy Release in Solar Flares II","authors":"L. S. Ledentsov","doi":"10.1134/S1063773725700161","DOIUrl":null,"url":null,"abstract":"<p>The method for estimating the spatial period of energy release in solar flares based on the application of a Fourier analysis to the difference images of flare arcades in the far ultraviolet is applied to the observations of the large solar flare on November 4, 2003. The flare occurred at the solar limb; the flare arcade extending along the solar limb was imaged in detail in the ultraviolet 195 Å channel of the TRACE satellite. The Fourier analysis of its difference images has shown the presence of a series of harmonics in the spatial distribution of the regions of flare energy release with characteristic periods lying in the range from 3.3 to 18.6 Mm. Such periodization may result from the decay of the preflare current layer accumulating the solar flare energy in coronal magnetic fields due to some instability of thermal, plasma, or other nature.</p>","PeriodicalId":55443,"journal":{"name":"Astronomy Letters-A Journal of Astronomy and Space Astrophysics","volume":"51 1","pages":"38 - 48"},"PeriodicalIF":0.8000,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astronomy Letters-A Journal of Astronomy and Space Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1063773725700161","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The method for estimating the spatial period of energy release in solar flares based on the application of a Fourier analysis to the difference images of flare arcades in the far ultraviolet is applied to the observations of the large solar flare on November 4, 2003. The flare occurred at the solar limb; the flare arcade extending along the solar limb was imaged in detail in the ultraviolet 195 Å channel of the TRACE satellite. The Fourier analysis of its difference images has shown the presence of a series of harmonics in the spatial distribution of the regions of flare energy release with characteristic periods lying in the range from 3.3 to 18.6 Mm. Such periodization may result from the decay of the preflare current layer accumulating the solar flare energy in coronal magnetic fields due to some instability of thermal, plasma, or other nature.
期刊介绍：
Astronomy Letters is an international peer reviewed journal that publishes the results of original research on all aspects of modern astronomy and astrophysics including high energy astrophysics, cosmology, space astronomy, theoretical astrophysics, radio astronomy, extragalactic astronomy, stellar astronomy, and investigation of the Solar system.
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