[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-204920-105":53,"doc-detail-204920-en":127},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":120,"head_meta":122,"extra_data":124,"updated_unix":126},105,"en","stitch-a-subgrid-scale-model-for-energy-buildup-in-the-solar-corona","STITCH - A Subgrid-Scale Model for Energy Buildup in the Solar Corona","","The solar corona shows frequent explosive activity, especially coronal mass ejections and eruptive flares, whose global impacts follow from their origin in narrow, sinuous filament channels. Channel formation and evolution depend on much smaller spatial scales and longer timescales, creating major separations of characteristic lengths and times. The article presents STITCH, a physics-based subgrid-scale model for helicity condensation, injecting tangential magnetic flux in MHD simulations, matching full calculations while reducing computational cost and improving flexibility for localized channels and complex surface-flux distributions.",{"@graph":63,"@context":119},[64,80,102],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/stitch-a-subgrid-scale-model-for-energy-buildup-in-the-solar-corona/204920/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/stitch-a-subgrid-scale-model-for-energy-buildup-in-the-solar-corona/204920.png","ImageObject",442,249,{"name":88,"@type":89},"Mabel","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-28","2026-09-05",true,{"@type":98,"interactionType":99,"userInteractionCount":101},"InteractionCounter",{"@type":100},"ViewAction",8,{"@type":103,"mainEntity":104},"FAQPage",[105,111,115],{"name":106,"@type":107,"acceptedAnswer":108},"What is STITCH and what does it model in solar eruptive simulations?","Question",{"text":109,"@type":110},"STITCH is a physics-based subgrid-scale model that represents helicity condensation and injects tangential magnetic flux into the low corona to generate eruptive filament structures in MHD simulations.","Answer",{"name":112,"@type":107,"acceptedAnswer":113},"How does STITCH relate to helicity condensation and filament channel formation?",{"text":114,"@type":110},"Helicity condensation is described as small-scale vortical convection forming current sheets, with reconnection mediating an inverse cascade of magnetic helicity and free energy, producing filament channels; STITCH abstracts these complex dynamics into a single term.",{"name":116,"@type":107,"acceptedAnswer":117},"What benefits does STITCH provide compared with explicit helicity-condensation calculations?",{"text":118,"@type":110},"STITCH agrees well with full explicit calculations while substantially reducing temporal duration and spatial resolution requirements.","https://schema.org",{"og:url":78,"og:type":121,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":123,"canonical":78},"index,follow",{"doc_id":125,"site_id":56},204920,1791745286,{"code":4,"msg":5,"data":128},{"doc_id":125,"user_id":129,"nickname":88,"user_avatar":130,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":101,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":136,"language":137,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":138,"faqs":139,"seo_title":140,"seo_description":61,"update_tm":141,"read_time":142},7971474920318,"https://ap-avatar.wpscdn.com/avatar/74000ee537e6b0ca360?x-image-process=image/resize,m_fixed,w_180,h_180&k=1788430171632181674","1 Draft version December 9, 2022  \nTypeset using LATEX preprint style in AASTeX63  \nSTITCH: A Subgrid-Scale Model for Energy Buildup in the Solar Corona  \n2 J. T. Dahlin, 1 C. R. DeVore, 1 and S. K. Antiochos 1  \n3 1 Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771  \n4 (Received December 9, 2022; Revised December 9, 2022; Accepted December 9, 2022)  \n5 Submitted to ApJ  \n6 ABSTRACT  \n7 The solar corona routinely exhibits explosive activity, in particular coronal mass  \n8 ejections and their accompanying eruptive 􀀍ares, that have global-scale consequences.  \n9 These events and their smaller counterparts, coronal jets, originate in narrow, sinuous  \n10 􀀌lament channels. The key processes that form and evolve the channels operate on still  \n11 smaller spatial scales and much longer time scales, culminating in a vast separation of  \n12 characteristic lengths and times that govern these explosive phenomena. In this article, 13 we describe implementation and tests of an e􀀎cient subgrid-scale model for generating  \n14 eruptive structures in magnetohydrodynamics (MHD) coronal simulations. STITCH {  \n15 STatistical InjecTion of Condensed Helicity { is a physics-based, reduced representa- 16 tion of helicity condensation: a process wherein small-scale vortical surface convection  \n17 forms ubiquitous current sheets, and pervasive reconnection across the sheets mediates  \n18 an inverse cascade of magnetic helicity and free energy, thereby forming the 􀀌lament  \n19 channels. We have developed a formalism, STITCH, that abstracts these complex pro- 20 cesses into a single term in Ohm's law and the induction equation that directly injects  \n21 tangential magnetic 􀀍ux into the low corona. We show that our approach is in very good  \n22 agreement with a full helicity-condensation calculation that treats all of the dynamics  \n23 explicitly, while enabling substantial reductions in temporal duration and spatial reso- 24 lution. In addition, we illustrate the 􀀍exibility of STITCH at forming localized 􀀌lament  \n25 channels and at energizing complex surface 􀀍ux distributions that have sinuous bound- 26 aries. STITCH is simple to implement and computationally e􀀎cient, making  \n27 it a powerful technique for physics-based modeling of solar eruptive events.  \n28 Keywords: Sun: coronal mass ejections (CMEs), Sun: corona | Sun: magnetic 􀀌elds  \n29 | Sun: 􀀍ares | Sun: 􀀌laments, prominences | magnetic reconnection  \n30 1. INTRODUCTION  \n31 Solar eruptions are the most energetic explosive events in the solar system. The largest of these  \n32 events, known as coronal mass ejections (CMEs), release vast quantities of solar plasma and magnetic  \nCorresponding author: J. T. Dahlin  \n[joel.t.dahlin@nasa.gov](joel.t.dahlin@nasa.gov)  \n2 Dahlin et al.  \n33 􀀌elds into the solar wind, generating shocks that disturb the entire heliosphere, driving hazardous  \n34 energetic particles and magnetospheric storms at Earth. A major goal of solar modeling e􀀋orts is  \n35 operational prediction of the events that present the greatest threats to human assets and technology.  \n36 A critical obstacle to achieving this goal, however, is the paucity of quantitative measurements of  \n37 the coronal magnetic 􀀌eld. Further complicating matters are the remarkable diversity of eruptions  \n38 in size, from CMEs that 􀀌ll the heliosphere down to coronal jets that span only a few Mm (Raoua􀀌 39 et al. 2016); the morphology of the erupting material in coronagraphs including both so-called stealth 40 CMEs (Ma et al. 2010) and halo CMEs (Howard et al. 1982); and the accompanying signatures in  \n41 the low atmosphere, in particular the chromospheric 􀀍are ribbons, which can be as simple as the  \n42 classic, linear two-ribbon structure or as complex as circular (Masson et al. 2009) or multi-ribbon  \n43 (Wang et al. 2014) con􀀌gurations, and the overlying arcades of 􀀍are loops in the corona.  \n44 Despite such diversity in eruptive manifestations, the energy s","cbCaitYR5kaKYkjG","https://ap.wps.com/l/cbCaitYR5kaKYkjG","pdf",12498211,27,"English","# ABSTRACT\n# Keywords\n# 1. INTRODUCTION\n## Solar eruptions and CMEs\n## Filament channels and eruption triggers\n## Modeling approaches for filament-channel formation","[{\"question\":\"What is STITCH and what does it model in solar eruptive simulations?\",\"answer\":\"STITCH is a physics-based subgrid-scale model that represents helicity condensation and injects tangential magnetic flux into the low corona to generate eruptive filament structures in MHD simulations.\"},{\"question\":\"How does STITCH relate to helicity condensation and filament channel formation?\",\"answer\":\"Helicity condensation is described as small-scale vortical convection forming current sheets, with reconnection mediating an inverse cascade of magnetic helicity and free energy, producing filament channels; STITCH abstracts these complex dynamics into a single term.\"},{\"question\":\"What benefits does STITCH provide compared with explicit helicity-condensation calculations?\",\"answer\":\"STITCH agrees well with full explicit calculations while substantially reducing temporal duration and spatial resolution requirements.\"}]","STITCH - A Subgrid-Scale Model for Energy Buildup in the Solar Corona | PDF",1788576483,9]