Abstract


  P-MODE ABSORPTION AND MHD WAVE GENERATION IN SUNSPOTS USING HELIOSEISMOLOGY AND VECTOR POLARIMETRY

  A. Norton, Stanford University, aanorton@stanford.edu

The equi-partition (beta=1) layer in the solar atmosphere is a messy environment in which to observe MHD waves. An incomplete understanding of mode conversion, reflection and refraction, combined with uncertainties in the quantities derived from vector polarimetric inversions, has resulted in maddeningly slow progress. However, we also work in exciting times with access to sophisticated instruments and data. We present results from coordinated observations between Hinode SOT/SP, IRIS and SDO/HMI in which we analyze time series for ARs 12186 (11.10.2014) and 12434 (17.10.2015). The purpose of the observations is to search for signatures of MHD waves in strong field regions in fast map Hinode SP data after quantifying the decrease in p-mode power in HMI data. We obtain more than 6 hours of data for each AR with a cadence higher than 60 seconds. We use the HMI vector magnetogram and Dopplergram data to study the dynamics in the larger FOV and IRIS to examine the response of the higher layers.