Comparison of Coronal Dimming Behavior Between XRT and AIA Data

Carson King 8/2/17 Title: A Comparison of Coronal Dimming Behavior Between XRT and AIA Data Authors: Carson King, Mark Weber, Patricia Jibben A coronal dimming is an event that takes place in the sun’s atmosphere, in which a patch of bright plasma seemingly disappears leaving a dark spot. These events are often associated with other solar phenomena such as flares and coronal mass ejections. Over the lifetimes of the SDO/AIA and Hinode/XRT telescopes many of these dimmings have been observed, however very few have been studied using XRT data. For this project one event was selected, and the goal was to measure how the area of the dimming region behaved over time in relation to other events in the area. In doing this, a new objective method for determining a threshold between the dimming region and the surrounding area was developed which can now be used to analyze the area of almost any dimming region. After comparing the region’s behavior over multiple wavelengths, our results support the common theory that these dimmings are caused by an evacuation of plasma due to opening magnetic field lines, rather than a sudden temperature change.