NDLI: OBSERVATIONS OF FAINT, OUTLYING LOOP SYSTEMS IN LARGE FLARES

Content Provider	Springer Nature Link
Author	Neidig, Donald F. Švestka, ZdenĚk Cliver, Edward W. Airapetian, Vladimir Henry, Timothy W.
Copyright Year	1997
Abstract	Faintly visible, darkened regions in Hα lying outside but adjacentto bright flare emissionwere found to occur in 10 of 31 major flares investigated. Without exception, the darkenings occur over ‘magnetically neutral’ areas, and these are usually bordered by ridges ofoppositely-poled field, where one border is shared in common with a flare ribbon. Thedarkenings probably result from the formation of faint, outlying loop systems, similar topost-flare loops seen in absorption, but which are connected to magnetic features outsidethe flare and are unresolved or only marginally resolved in patrol images. Simple modelsfor post-flare loops incorporating the results of statistical equilibrium calculations readilydemonstrate that darkenings of several percent (consistent with our photometric measurements) can be produced by loop structures of cross-sectional diameter ≈ 10$^{2}$ km (unresolved by patrol instruments) and containing gas at densities 5 × 10$^{10}$–5 × 10$^{11}$ cm$^{-3}$ andtemperatures 8000–15000 K. Outlying loop systems might be formed by magnetic fieldreconnection, analogous to the mechanism ascribed to eruptive two-ribbon flares, butassociated with field structures adjacent to the flare. Alternatively, these outlying loopsystems may not erupt but become visible as a result of heating and chromospheric evaporation at the footpoints shared with the flare ribbon. In either case, the observations presented here have interesting implications for both the spatial scale and the topology of thecoronal magnetic fields in which eruptions occur.
Starting Page	321
Ending Page	339
Page Count	19
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	170
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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OBSERVATIONS OF FAINT, OUTLYING LOOP SYSTEMS IN LARGE FLARES