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Direct Observations of Magnetic Reconnection Outflow and CME Triggering in a Small Erupting Solar Prominence  

Kathy Reeves   Submitted: 2015-05-28 09:50

We examine a small prominence eruption that occurred on 2014 May 1 at 01:35 UT and was observed by the Interface Region Imaging Spectrometer ( IRIS) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory ( SDO). Pre- and post-eruption images were taken by the X-Ray Telescope (XRT) on Hinode. Pre-eruption, a dome-like structure exists above the prominence, as demarcated by coronal rain. As the eruption progresses, we find evidence for reconnection between the prominence magnetic field and the overlying field. Fast flows are seen in AIA and IRIS, indicating reconnection outflows. Plane-of-sky flows of ~300 km s-1 are observed in the AIA 171 Å channel along a potentially reconnected field line. IRIS detects intermittent fast line-of-sight flows of ~200 km s-1 coincident with the AIA flows. Differential emission measure calculations show heating at the origin of the fast flows. Post-eruption XRT images show hot loops probably due to reconfiguration of magnetic fields during the eruption and subsequent heating of plasma in these loops. Although there is evidence for reconnection above the prominence during the eruption, high spatial resolution images from IRIS reveal potential reconnection sites below the prominence. A height-time analysis of the erupting prominence shows a slow initial rise with a velocity of ~0.4 km s-1 followed by a rapid acceleration with a final velocity of ~250 km s-1. Brightenings in IRIS during the transition between these two phases indicate the eruption trigger for the fast part of the eruption is likely a tether-cutting mechanism rather than a break-out mechanism.

Authors: Katharine K. Reeves, Patrick I. McCauley and Hui Tian
Projects: Hinode/XRT,IRIS,SDO-AIA

Publication Status: Accepted in ApJL
Last Modified: 2015-05-30 04:31
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Thermal Properties of A Solar Coronal Cavity Observed with the X-ray Telescope on Hinode  

Kathy Reeves   Submitted: 2011-11-03 15:20

This abstract was corrupted following database problems and is being recovered. It will be restored as quickly as possible. Any questions, please send them to Alisdair. Sorry for any incovenience.


Authors: Reeves, K. K., Gibson, S. E., Kucera, T. A., Hudson, H. S. and Kano, R.
Projects: Hinode/XRT,SoHO-EIT,STEREO

Publication Status: Submitted to ApJ
Last Modified: 2011-11-03 15:21
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AIA Observations of Hot Flare Plasma  

Kathy Reeves   Submitted: 2011-01-04 09:05

We present observations of hot plasma from solar eruptions recorded by the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). AIA is the first narrowband instrument capable of taking images of hot plasma in the 5-15 MK range. We find that there are hot structures above flare loops, and that they are typically more diffuse and nebulous than the well-defined flare loops. Because of the narrowband response, high sensitivity and high spatial resolution of AIA, these supra-arcade structures are visible in exquisite detail, particularly in the 131~AA and 94~AA channels. In one event, a C4.9 flare observed on 3 November 2010, hot plasma is seen to outline an erupting plasmoid, and possibly a current sheet. We compare hot plasma observed with AIA to structures observed with the X-Ray Telescope (XRT) on the {it Hinode} mission, and find that the plasma imaged in AIA contains more fine detail. These new AIA observations show that supra-arcade flare structures and CMEs are highly structured not only in space and time, but also in temperature. This thermal structuring is expected, based on modeling efforts, but has now been imaged directly for the first time over a large range of temperatures.

Authors: Reeves, K. K and Golub, L.
Projects: Hinode/XRT

Publication Status: accepted in ApJL
Last Modified: 2011-01-04 13:19
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Subject will be restored when possible  

Kathy Reeves   Submitted: 2008-04-15 16:04

We examine phenomena associated with eruptions in the two different regimes of the solar corona and the terrestrial magnetosphere. We find striking similarities between the speeds of shrinking magnetic field lines in the corona and dipolarization fronts traversing the magnetosphere. We also examine the similarities between supra-arcade downflows observed during solar flares and bursty bulk flows seen in the magnetotail, and find that these phenomena have remarkably similar speeds, velocity profiles and size scales. Thus we show manifest similarities in the magnetic reconfiguration in response to the ejection of coronal mass ejections in the corona and the ejection of plasmoids in the magnetotail. The subsequent return of loops to a quasi-potential state in the corona and field dipolarization in the magnetotail are physical analogs and trigger similar phenomena such as downflows, which provides key insights into the underlying drivers of the plasma dynamics.

Authors: K. K. Reeves, T. B. Guild, W. J. Hughes, K. E. Korreck, J. Lin, J. Raymond, S. Savage, N. A. Schwadron, H. E. Spence, D. F. Webb, M. Wiltberger
Projects: Hinode/XRT,TRACE

Publication Status: in press
Last Modified: 2008-04-16 05:32
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Subject will be restored when possible  

Kathy Reeves   Submitted: 2008-04-15 16:04

We examine phenomena associated with eruptions in the two different regimes of the solar corona and the terrestrial magnetosphere. We find striking similarities between the speeds of shrinking magnetic field lines in the corona and dipolarization fronts traversing the magnetosphere. We also examine the similarities between supra-arcade downflows observed during solar flares and bursty bulk flows seen in the magnetotail, and find that these phenomena have remarkably similar speeds, velocity profiles and size scales. Thus we show manifest similarities in the magnetic reconfiguration in response to the ejection of coronal mass ejections in the corona and the ejection of plasmoids in the magnetotail. The subsequent return of loops to a quasi-potential state in the corona and field dipolarization in the magnetotail are physical analogs and trigger similar phenomena such as downflows, which provides key insights into the underlying drivers of the plasma dynamics.

Authors: K. K. Reeves, T. B. Guild, W. J. Hughes, K. E. Korreck, J. Lin, J. Raymond, S. Savage, N. A. Schwadron, H. E. Spence, D. F. Webb, M. Wiltberger
Projects: Hinode/XRT,TRACE

Publication Status: in press
Last Modified: 2008-09-23 21:10
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Kathy Reeves   Submitted: 2007-11-08 15:51

The X-Ray Telescope on Hinode has observed individual loops of plasma moving downward in a manner that is consistent with field line shrinkage in the aftermath of reconnection at higher altitudes. A on-disk B3.8 flare observed on May 02, 2007, has loops that clearly change in shape from cusp-shaped to more rounded. In addition, bright loops are observed that decrease in altitude with a speed of approximately 5 km s-1 and fainter, higher loop structures shrink with a velocity of 48 km s-1. A C2.1 flare observed on December 17, 2006, also has loops that change shape. Many bright features are seen to be moving downward in this event, and we estimate their speed to be around 2-4 km s-1. We measure the shrinkage in both of these events, and find that it is 17-27%, which is consistent with theoretical predictions.

Authors: Reeves, K. K., Seaton, D. B. and Forbes, T. G.
Projects: Hinode

Publication Status: ApJ (in press)
Last Modified: 2007-11-09 07:53
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Abstracts by Author
Direct Observations of Magnetic Reconnection Outflow and CME Triggering in a Small Erupting Solar Prominence
Thermal Properties of A Solar Coronal Cavity Observed with the X-ray Telescope on Hinode
AIA Observations of Hot Flare Plasma
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