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Imaging Spectroscopy using AIA diffraction patterns in conjunction with RHESSI and EVE observations  

Claire Raftery   Submitted: 2011-11-17 16:29

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: Claire L. Raftery, Säm Krucker, and Robert P. Lin
Projects: RHESSI,SDO-AIA,SDO-EVE

Publication Status: Accepted
Last Modified: 2011-11-18 09:30
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Evidence for internal tether-cutting in a flare/CME observed by MESSENGER, RHESSI and STEREO  

Claire Raftery   Submitted: 2010-07-27 17:59

The relationship between eruptive flares and coronal mass ejections (CME) is a topic of ongoing debate, especially regarding the possibility of a common initiation mechanism. We studied the kine- matic and hydrodynamic properties of a well-observed event that occurred on 2007 December 31 using data from MESSENGER, RHESSI and STEREO, in order to gain new physical insight into the evo- lution of the flare and CME. The initiation mechanism was determined by comparing observations to the internal tether-cutting, breakout and ideal MHD models. Evidence of pre-eruption reconnection immediately eliminated the ideal MHD model. The timing and location of the soft and hard X-ray sources led to the conclusion that the event was initiated by the internal tether-cutting mechanism. In addition, a thermal source was observed to move in a downward direction during the impulsive phase of the event, followed by upwards motion during the decay phase, providing evidence for X- to Y-type magnetic reconnection.

Authors: Claire L. Raftery, Peter T. Gallagher, R. T. James McAteer, Chia-Hsien Lin, Gareth Delahunt
Projects: RHESSI,STEREO

Publication Status: Accepted
Last Modified: 2010-07-28 04:42
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Multi-wavelength observations and modelling of a canonical solar flare  

Claire Raftery   Submitted: 2008-12-01 09:12

This paper investigates the temporal evolution of temperature, emission measure, energy loss and velocity in a C-class solar flare from both an observational and theoretical perspective. The properties of the flare were derived by following the systematic cooling of the plasma through the response functions of a number of instruments - RHESSI (5 MK), GOES-12 (5-30 MK), TRACE 171A (1 MK) and CDS (0.03-8 MK). These measurements were studied in combination with simulations from the 0-D Enthalpy Based Thermal Evolution of Loops (EBTEL) model. At the flare on-set, upflows of ~90 km s-1 and low level emission were observed in Fe XIX, consistent with pre-flare heating and gentle chromospheric evaporation. During the impulsive phase, upflows of ~80 km s-1 in Fe XIX and simultaneous downflows of ~20 km s-1 in He I and O V were observed, indicating explosive chromospheric evaporation. The plasma was subsequently found to reach a peak temperature of ~13 MK in approximately 10 minutes. Using EBTEL, conduction was found to be the dominant loss mechanism during the initial ~300s of the decay phase. It was also found to be responsible for driving gentle chromospheric evaporation during this period. As the temperature fell below ~8 MK, and for the next ~4,000s, radiative losses were determined to dominate over conductive losses. The radiative loss phase was accompanied by significant downflows of <40 km s-1 in O V. This is the first extensive study of the evolution of a canonical solar flare using both spectroscopic and broad-band instruments in conjunction with a hydrodynamic model. While our results are in broad agreement with the standard flare model, the simulations suggest that both conductive and non-thermal beam heating play important roles in heating the flare plasma during the impulsive phase of at least this event.

Authors: Claire L. Raftery, Peter T. Gallagher, Ryan O. Milligan, James A. Klimchuk
Projects: RHESSI,SoHO-CDS,TRACE

Publication Status: A&A (accepted)
Last Modified: 2008-12-02 09:30
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Abstracts by Author
Imaging Spectroscopy using AIA diffraction patterns in conjunction with RHESSI and EVE observations
Evidence for internal tether-cutting in a flare/CME observed by MESSENGER, RHESSI and STEREO
Multi-wavelength observations and modelling of a canonical solar flare

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