On the Nature of the High-Speed Plasma Flows in the 2005 September 13 Flare

Details On the Nature of the High-Speed Plasma Flows in the 2005 September 13 Flare On the Nature of the High-Speed Plasma Flows in the 2005 September 13 Flare

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51c..19l&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP51C-19

Physics

7519 Flares

Scientific paper

A long-duration, successive flaring event accompanied by fast CMEs occurred on 2005 September 13 in the NOAA AR 10808 and was classified as 2B/X1.5 with peak time at 19:27 UT. In this study, we report direct and unambiguous observations of high-speed hot plasma flows associated with the second major peak in soft X-ray that reached X1.4 on the GOES scale at 20:05 UT. The flows are seen as streams of enhanced density in extreme-UV traveling above and toward arcades of the secondary compact-loop flare at the main δ spot with an apparent speed as high as ~350~km~s-1, and the times when they are initiated correspond to those of bursts of nonthermal emissions in hard X-rays (HXRs) and microwaves. In Hα, the flows appear to become emission later on when approaching the lower atmosphere nearby the flaring magnetic polarity inversion line and subsequently trigger a subflare with propagating kernels. It is particularly notable that the flows are spatially and temporally related to HXR sources detected by RHESSI and a large erupting flux rope. We scrutinize several scenarios to investigate the nature of the observed high-speed flows. We conclude that the observations could be interpreted in terms of materials braking away from a preceding filament eruption and falling gravitationally back into the flaring region. A separate scenario is that the observed flow motion could be a manifestation of sunward reconnection outflow supporting the standard reconnection model.

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