1 / 20

TRACE Downflows and Energy Release

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

nash-smith
Download Presentation

TRACE Downflows and Energy Release

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TRACE Downflows and Energy Release Ayumi ASAI Kwasan Observatory, Kyoto University Magnetic Reconnection and the Dynamic Sun 9 September, 2003 @St. Andrews

  2. Downflow Motion • Yohkoh (SXT) hasfound downflows above post-flare loops McKenzie and Hudson 1999 McKenzie 2000 • velocity: 45–500 km/s • dark feature • often seen in the decay phase of LDEs Yohkoh/SXT : McKenzie 2000

  3. TRACE Downflow • Recently TRACE also has found the downflows above post-flare loops Innes et al. (2003) spectroscopic analyses with SOHO/SUMER flow of rarefied plasma? we examine such TRACE downflowmotions with higher spatial resolution we examine evolution of the region where the downflows are seen ex) : 21 April, 2002 flare

  4. 2002 July 23 Flare NOAA 0039 • Flare • 2002-July-23 00:15UT • GOES X4.8 • NOAA 0039 (SE limb) • Data • EUV…TRACE (195Å) • HXR...RHESSI • microwave…NoRH GOES flux NoRH 17GHz NoRH 34GHz 00:00 02:00 01:00

  5. TRACE (195Å) Movie EUV (195Å) images obtained with TRACE This filter is sensitive to 106 K plasma and 107 K plasma East West

  6. TRACE (195Å) Movie Running difference movie of TRACE 195Å images Downflows are seen as dark features East West

  7. Time Slice Image Time slice image downflow super hot plasma (10MK) TRACE 195Å post-flare loop (1MK) time

  8. Velocity of Downflows TRACE 195A Time slice image slit A slit A slit B downflow velocity: 100 – 250 km/s ~previous results slit B

  9. Time of Downflows Time slice image These TRACE downflows are seen not only in the decay phase but also in the impulsive phase and main phase GOES NoRH 17GHz NoRH 34GHz 00:00 01:00 02:00

  10. Timing of Downflows TRACE 195A Time slice image slit A slit A slit B The timings of the down flows correspond to microwave/HXR bursts. slit B RHESSI 50-100keV

  11. Timing of Downflows TRACE 195A Time slice image slit A slit A slit B The timings of the down flows correspond to microwave/HXR bursts. slit B NoRH 17GHz

  12. Ascending Loop Top Time slice image ascending velocity ~ 40 km/s super hot plasma (10MK) TRACE 195Å post-flare loop (1MK) ~ 20 km/s time

  13. Ascending Motion (TRACE) height velocity microwave HXR superhot region moving upward as the flare progresses ascending velocity is enhanced when nonthermal bursts occur

  14. Ascending Motion (RHESSI) height velocity microwave HXR HXR coronal source is also pushed upward when nonthermal bursts occur Krucker 2003

  15. Summary • Features of the TRACE Downflow Motion • speed : 100-250 km/s • seen in the impulsive-main-decay phase • Downflows show good correlations with HXR/microwave bursts • downflows are closely related to reconnection outflow!? • Superhot region ascends when the nonthermal bursts occur (Neupert effect)

  16. Multiple Plasmoid Ejection Multiple plasmoid-ejections 2000 November 24 flare shows many plasmoid ejections, and each of them is ejected at the time corresponding to the HXR burst. Takasaki (2003) Time slice image Yohkoh/SXT

  17. Reconnection Outflow? plasmoid ejection • Many plasmoids (magnetic islands) are formed in a current sheet. • They consist the reconnection outflows. upward ejection : plasmoid ejections downward ejection : downflows downflows

  18. What are Downflows…? propagation of reconnection outflows Tandokoro (2003)

  19. What are Downflows…? simulation observation

  20. Evolution of Ha Ribbon slit projected separation velocity ~ 7 km/s ↓ corrected separation velocity ~ 25 km/s

More Related