DAVINA INNES

• Explosive Events

• 19 June 1998 - SUMER (Si IV, OIV), TRACE (C IV, Fe IX) and MDI

• Microflare structure and the underlying magnetic field
  An analysis of the SUMER (Si IV, OIV), TRACE (C IV, Fe IX) and MDI data from 19 June 1998 will be presented. The SUMER data track the changes in line profiles from a single narrow slice of quiet Sun network over a three hour period. The field-of-view crosses several network cells and lanes where the underlying field shows distinctly different geometry and evolution. The emphasis will be on the relationship between high Doppler shift events and the structure of the microflare emission in the TRACE images and how they vary with changes in the complexity of the underlying magnetic field.
  I have also analysed the O IV line ratios and find what looks like waves of compression and rarefaction continually moving across the transition region. I would hope to be able to discuss the implications of this finding and whether other shock signatures are noticeable in the datasets at other wavelengths.
  Another issue that I would like to discuss is whether we can determine the height of the primary energy release. For example are transition region brightenings a secondary effect due to energy release in the corona or photosphere?

• A copy of a paper on my analysis on June 19 dataset can be found at ftp://unix1.mpae.gwdg.de/pub/mpae/users/innes/jun19/jun19.pdf