Investigation of coronal loop temperatures using three EUV filters and implications for future work with Solar-B

J. B. Noglik, R. W. Walsh, J. Ireland

In 2002 Chae et al. proposed a two filter ratio method for determining unambiguous temperature values for the plasma in the solar corona. When applying this method to SOHO/EIT and TRACE data it was found that outside the range of 0.7 - 4 MK the errors for the instrument response functions were so large that the values could not be trusted. With this limited temperature range, this paper uses this technique to analyse a SOHO/EIT data set of loops at the solar limb. It is found that none of the points taken from along the coronal structure sat on the colour-colour curve. This could be due to a number of different reasons such as the time lapse between the three EUV images, the fairly poor resolution of EIT, plasma flows along the loop or perhaps we are looking through a multi-thermal atmosphere. Considering the latter, using a simple two temperature approach, it was found that it is possible to reproduce our results in this way.

Correspondence

Jane Noglik, University of Central Lancashire

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