Abstract


  THE THERMAL RESPONSE OF SUNSPOT ATMOSPHERES TO UMBRAL FLASHES

  S. Grant, Queen's University Belfast, sgrant19@qub.ac.uk
  D. Jess, Queen's University Belfast, d.jess@qub.ac.uk

Upwardly propagating slow magnetoacoustic waves are believed to be the cause of (quasi-)periodic shock brightenings in the umbrae of chromospheric sunspots. Previously, tentative evidence has been shown to suggest that umbral flashes are directly related to heightened localised temperatures within the umbral plasma.

Here, a fast thermal inversion code is utilised on Calcium 8542 spectral imaging scans from the IBIS instrument at the Dunn Solar Telescope to derive a statistical analysis of flash heating. The high spatial, spectral and temporal resolutions of the IBIS data allows for a 3-D insight into oscillatory thermal signatures within the umbra, with an in-depth investigation of the plasma heating abilities of (quasi-)periodic umbral flashes at unprecedented scales.