SabriNA SAvage, Signatures of Magne(c Reconnec(on in the Extended Corona SabriNA SAvage, Mahew J....
Transcript of SabriNA SAvage, Signatures of Magne(c Reconnec(on in the Extended Corona SabriNA SAvage, Mahew J....
Observa(onalSignaturesofMagne(cReconnec(onintheExtendedCorona
SabriNASAvage,Ma>hewJ.West,DanielB.Seaton,AdamKobelski
[email protected] *Considerablecontribu(onsfromK.Reeves&D.McKenzie
https://ntrs.nasa.gov/search.jsp?R=20160005070 2018-05-20T17:38:49+00:00Z
Supra-ArcadeDownflows(SADs)Observa(ons
Fig1:McKenzie&Savage2009 Fig2:Savageetal.2011 Fig3:Savageetal.2012
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Fig2
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2011Oct22,SDO/AIA
2011May9,SDO/AIA
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- Teardrop-shapedvoidsobserved
totravelsunwardthroughthebright,hotfanextendingoutwardalongthespineofdevelopingpost-flarearcades.
- Observedwithhigh-temperatureinstrumenta(on(EUV,X-ray)&white-lightcoronagraph(density)
- LONGDURATIONEVENTS
1999Jan20,Yohkoh/SXT
2002Apr21,TRACE
2010Nov4,SOHO/LASCO
Sadpoles,nottadpoles
Supra-ArcadeDownflowingLoops(SADLs)Observa(ons
Fig1:Savage&McKenzie2011
Fig1 2003Nov4,TRACE 2010Nov3,SDO/AIA
2000Jan1,LASCO
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Supra-ArcadeDownflowingLoops(SADLs)Observa(ons
Fig1:Savage&McKenzie2011 Fig2:Savageetal.2010
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2003Nov4,TRACE
2008Apr9,Hinode/XRT
Behindthelimb
Supra-ArcadeDownflowingLoops(SADLs)Observa(ons
Fig1:Savage&McKenzie2011 Fig2:Savageetal.2010 Fig3:Savageetal.2012
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Fig32003Nov4,TRACE
2008Apr9,Hinode/XRT
2010Nov3,SDO/AIA
DifferentfromPlasmoidObserva(ons
Fig1:Savageetal.2010
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Fig3:Takasaoetal.2012 Fig4:Linetal.2004Fig2:Koetal.2003
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- Coherent‘bubble’ofemiingplasmaheldtogetherbymagne(cfields.
- Observedwithbroadband-temperatureinstrumenta(on(EUV,X-ray,HardX-ray)&white-lightcoronagraph(density)
Ø Magne4cIslands
DifferentfromPlasmoidObserva(ons
Fig1,2:Daughtonetal.2012 Fig3:Nishizukaetal.2013
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- Thinfluxtubescreatedduringthereconnec(onprocessacrossthecurrentsheet.
- Plasmoidsa3-Dproductofreconnec(onconcurrenttosingleloopcrea(on.
SADs+SADLs
Fig1:Savageetal.2012
Fig1 - SADsappeartobevoidscreatedbyloops(SADLs)shrinkingthroughthefanplasma.
SADs+SADLs
Fig1,2:Savageetal.2012
Fig1
Fig2
- SADsappeartobevoidscreatedbyloops(SADLs)shrinkingthroughthefanplasma.
Par(cleAccelera(on&Hea(ng
Fig1:Asaietal.2004(Khan;Liu)
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RHESSI+TRACE
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Downflows
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Downflows
VLA+AIA+RHESSI
Savage–2010Nov3flare
Fig3:Chenetal.2014;2015
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RHESSI+AIA
Fig1:Savageetal.2012
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- Basicreconnec(onscenario,postini(alfluxropeforma(onandrelease.
- Generalorganiza(onofthemagne(cfieldofthevariouscomponents(SADs,SADLs,plasmoids).
- Fieldlinesreconnectacrossthecurrentsheettoformouplowingfluxtubeswhileplasmoidsformalongthecurrentsheet.
- SADsareformedasthefluxtubes(SADLs)retractthroughhotplasmainthefan(otherwise,onlySADLsareobserved).
Fig1:Savageetal.2012
Strongpoten(alanalogywithmagnetotailsubstorms
Dipolarization Front/Bursty Bulk Flow
BBF Braking Region
South Pole** (ionosphere)
North Pole** (ionosphere)
Magnetotail current sheet
**Pole width exaggerated
Pre-substorm FieldLine Geometry
Wakes Behind Dipolarization Fronts
To Sun
Fig1 Fig2
Fig2:CourtesyofA.Kobelski,Reevesetal.2008
ModelConstraints
Fig1:Savage,McKenzie,&Reeves2012
OBSERVEDTEMPERATUREANDDENSITYALWAYSLOWERTHANFANFig1
Fig2:Hanneman&Reeves2014
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ModelSimula(onsa)
Pressurepulse+MHDwave(T>>fan)
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Peristal(cpumping(T~<fan)
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Reconnec(onouplows(T~<fan)
Toohotwithrespecttothesurroundings
Fig1:Cecereetal2012
Incorrectgeometrywithrespecttoobserva(ons
Fig3:Sco>etal2013Fig2:Cassaketal2013
Incomplete,feasible;Difficulttomatchtoobserva(ons
Fig1:Guoetal2014
Rayleigh-TaylorInstabili(esbehindretrac(ngfluxtubes(T>fan)
Toohotwithrespecttothesurroundings BUT Bestmatchtoobserva(onstodate(3D!!!)althoughearlyindevelopment
ModelSimula(ons
SADsintheExtendedCorona…“GiantArches”Flare–2014Oct14
Fig1:West&Seaton2015
Fig1PROBA-2/SWAP–174Å
~1.45R¤
SADsinthelowercoronaaretypicallyobservedwellazerreconnec(onhasoccurred.Intheextendedcorona,wearebe>erabletoobservethemigra(ngreconnec(onsites.Coronagraphsallowustoseereconnec(ondevelopbehindtheCMEwhilelookingdirectlyatthedensity.
SADsintheExtendedCorona…
PROBA-2/SWAPGI
LASCOC2PROBA-2/SWAP AIA131Å
A:Fla>enedfromayear’sworthofdataCleaned(cosmicrays,backgroundstars,planets)A>enuateddiskB:Smooth-Differenced-Scaled
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SADsintheExtendedCorona…LASCOC2
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SADsintheExtendedCorona…
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SADsintheExtendedCorona…
TBD1. Correlate
flowsdirectlytolightcurveasdonefor2010Nov3rdevent
2. Spa4allyandtemporallycorrelateRHESSIandHinode/XRTX-raycontourswithouWlows.
Summary&ForwardWork• Con(nua(onofshrinkingloopsimpartsenergyintothecurrentsheet
longazertheflare.Clearly.– Butforanen(reweek??– Doesthishappenallofthe(me?– Howdidthisonegrowsolarge?
• Densitystra(fica(on?Ac(veregioninterac(ons?
• Reconnec(onisfastandpatchy.• AddHinode/XRTandRHESSIdata(started).• Dofeaturestrackbetweenfieldsofviewbothways?
– Ini(alworkbegun.(SomeeveninLASCOC3.)
• Needforinstrumenta(ontofillthegapinobservingthetransi(oncorona
– Importanttobeinsinglewavelength– PossiblycomingtoanInterna(onalSpaceSta(onnearyou….