trace downflows and energy release
DESCRIPTION
TRACE Downflows and Energy Release. Ayumi ASAI Kwasan Observatory, Kyoto University Magnetic Reconnection and the Dynamic Sun 9 September, 2003 @St. Andrews. Downflow Motion. Yohkoh (SXT) has found downflows above post-flare loops McKenzie and Hudson 1999 McKenzie 2000 - PowerPoint PPT PresentationTRANSCRIPT
-
TRACE Downflows and Energy ReleaseAyumi ASAIKwasan Observatory, Kyoto University
Magnetic Reconnection and the Dynamic Sun9 September, 2003 @St. Andrews
-
Downflow MotionYohkoh (SXT) has found downflows above post-flare loopsMcKenzie and Hudson 1999McKenzie 2000velocity: 45500 km/sdark featureoften seen in the decay phase of LDEsYohkoh/SXT : McKenzie 2000
-
TRACE DownflowRecently TRACE also has found the downflows above post-flare loops
Innes et al. (2003)spectroscopic analyses with SOHO/SUMERflow of rarefied plasma?
we examine such TRACE downflow motions with higher spatial resolutionwe examine evolution of the region where the downflows are seenex) : 21 April, 2002 flare
-
2002 July 23 FlareFlare 2002-July-23 00:15UT GOES X4.8 NOAA 0039 (SE limb)DataEUVTRACE (195)HXR...RHESSImicrowaveNoRHNOAA 0039GOES fluxNoRH 34GHzNoRH 17GHz00:0001:0002:00
-
TRACE (195) MovieEastWestEUV (195)images obtained with TRACE
This filter is sensitive to106 K plasmaand107 K plasma
-
TRACE (195) MovieEastWestRunning difference movie of TRACE 195images
Downflows are seen as dark features
-
Time Slice ImageTRACE 195Time slice imagedownflowsuper hot plasma (10MK) post-flare loop (1MK)time
-
Velocity of Downflowsdownflow velocity: 100 250 km/s ~previous resultsTime slice imageTRACE 195Aslit Bslit Aslit Bslit A
-
Time of DownflowsThese TRACE downflows are seen not only in the decay phase but also in the impulsive phase and main phase GOESNoRH 17GHzNoRH 34GHz00:0001:0002:00Time slice image
-
Timing of DownflowsTRACE 195Aslit Bslit AThe timings of the down flows correspond to microwave/HXR bursts.Time slice imageslit Bslit ARHESSI 50-100keV
-
Timing of DownflowsTRACE 195Aslit Bslit AThe timings of the down flows correspond to microwave/HXR bursts.Time slice imageslit Bslit ANoRH 17GHz
-
Ascending Loop TopTRACE 195Time slice imagesuper hot plasma (10MK) post-flare loop (1MK)timeascending velocity~ 40 km/s~ 20 km/s
-
Ascending Motion (TRACE)ascending velocity is enhanced when nonthermal bursts occurheightvelocitysuperhot region moving upward as the flare progressesHXRmicrowave
-
Ascending Motion (RHESSI)Krucker 2003heightvelocityHXR coronal source is also pushed upward when nonthermal bursts occurmicrowaveHXR
-
SummaryFeatures of the TRACE Downflow Motion speed : 100-250 km/s seen in the impulsive-main-decay phaseDownflows show good correlations with HXR/microwave burstsdownflows are closely related to reconnection outflow!?Superhot region ascends when the nonthermal bursts occur (Neupert effect)
-
Multiple Plasmoid EjectionTime slice image2000 November 24 flare shows many plasmoid ejections, and each of them is ejected at the time corresponding to the HXR burst.Takasaki (2003)Yohkoh/SXTMultiple plasmoid-ejections
-
Reconnection Outflow?Many plasmoids (magnetic islands) are formed in a current sheet.They consist the reconnection outflows.upward ejection :plasmoid ejectionsdownward ejection : downflowsplasmoid ejectiondownflows
-
What are Downflows?Tandokoro (2003)propagation of reconnection outflows
-
What are Downflows?simulationobservation
-
Evolution of Ha Ribbonprojectedseparation velocity~ 7 km/sslitcorrected separation velocity ~ 25 km/s