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Deconstructing active region AR10961 using STEREO, Hinode, TRACE & SOHO  

Jane Benedetta Noglik   Submitted: 2008-07-28 08:15

Active region 10961 was observed over a five day period (2007 July 2-6) by instrumentation on-board STEREO, Hinode, TRACE and SOHO. As it progressed from Sun centre to the solar limb a comprehensive analysis of the EUV, X-ray and magnetic field data reveals clearly observable changes in the global nature of the region. Temperature analyses undertaken using STEREO EUVI double filter ratios and XRT single and combined filter ratios demonstrate an overall cooling of the region from between 1.6 - 3.0 MK to 1.0 - 2.0 MK over the five days. Similarly, Hinode EIS density measurements show a corresponding increase in density of 27 %. Moss, cool (1 MK) outer loop areas and hotter core loop regions were examined and compared with potential magnetic field extrapolations from SOHO MDI magnetogram data. In particular it was found that the potential field model was able to predict the structure of the hotter X-ray loops and that the larger cool loops seen in 171 Angstrom images appeared to follow the separatrix surfaces. The reasons behind the high density moss regions only observed on one side of the active region are examined further.

Authors: Jane B. Noglik, Robert W. Walsh & Rhona C. Maclean
Projects: Hinode/EIS,Hinode/XRT,SoHO-MDI,STEREO,TRACE

Publication Status: Submitted to ApJ
Last Modified: 2008-09-23 20:52
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Jane Benedetta Noglik   Submitted: 2008-07-28 08:14

Active region 10961 was observed over a five day period (2007 July 2-6) by instrumentation on-board STEREO, Hinode, TRACE and SOHO. As it progressed from Sun centre to the solar limb a comprehensive analysis of the EUV, X-ray and magnetic field data reveals clearly observable changes in the global nature of the region. Temperature analyses undertaken using STEREO EUVI double filter ratios and XRT single and combined filter ratios demonstrate an overall cooling of the region from between 1.6 - 3.0 MK to 1.0 - 2.0 MK over the five days. Similarly, Hinode EIS density measurements show a corresponding increase in density of 27~%. Moss, cool (1 MK) outer loop areas and hotter core loop regions were examined and compared with potential magnetic field extrapolations from SOHO MDI magnetogram data. In particular it was found that the potential field model was able to predict the structure of the hotter X-ray loops and that the larger cool loops seen in 171~{AA} images appeared to follow the separatrix surfaces. The reasons behind the high density moss regions only observed on one side of the active region are examined further.

Authors: Jane B. Noglik, Robert W. Walsh & Rhona C. Maclean
Projects: Hinode/EIS,Hinode/XRT,SoHO-MDI,STEREO,TRACE

Publication Status: Submitted to ApJ
Last Modified: 2008-09-23 20:53
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Jane Benedetta Noglik   Submitted: 2007-10-15 09:19

In this paper we aim to measure the temperature along a specific coronal loop feature which is located in an active region on the western solar limb. The data is taken from Joint Observing Programme 146 and consists of high cadence TRACE triple filter images coinciding with sparse raster CDS spectroscopic data. The double filter ratio temperature analysis technique is applied to two sets of TRACE images having a 20 minute time gap resulting in temperatures between 1.0-1.3 MK. The CDS sparse raster line intensities are used to create emission measure (EM) loci plots determining temperature values over an overlapping 40 minute observing period. These plots appear to be consistent with a line of sight isothermal structure which increases in temperature from sim1.20 MK to sim1.75 MK over the observing period; in contrast, EM loci plots for nearby background pixels depict multi-thermal emission. Possible reasons for the difference between the TRACE and CDS results and the implications of this analysis upon future observations is discussed.

Authors: J. B. Noglik, R. W. Walsh & J. Cirtain
Projects: None

Publication Status: ApJ resubmitted
Last Modified: 2007-10-15 10:07
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Deconstructing active region AR10961 using STEREO, Hinode, TRACE & SOHO
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