Ref: CTALK-2018-0047

Post-Flare Giant Arches - Unanswered Questions

West, Matthew ; Seaton, Daniel ; Dennis, Brian ; Feng, Li ; Palmerio, Erika ; Savage, Sabrina

Talk presented at AGU, New Orleans, USA on 2017-12-15

Abstract: Recent observations from the SWAP EUV imager on-board PROBA2 and SXI X-ray observations from the GOES satellite have shown that post-flare giant arches and regular post-flare loops are one and the same thing. However, it is still not clear how certain loop systems are able to sustain prolonged growth to heights greater than half a solar-radii. In this presentation we further explore the energy deposition rate above post-flare loop systems through high-energy RHESSI observations. We also explore the difference between the growth of different loop systems through an epoch analysis. The epoch analysis is initially performed over the period when the STEREO satellites were in quadrature with PROBA2 allowing us to assess the difference between their on-disk and on-limb signatures. Giant arches are generally characterised by their height of growth when observed close to the solar limb, but due to the optically thin nature of the EUV solar atmosphere, projection effects and the scarcity of events occurring within 5 degrees of the limb it is not understood how common these events are. Using the analysis during the quadrature period we gain a better understanding of how rare these events are, and by determining characteristic on disk signatures we can combine our data set with magnetogram observations to better understand their magnetic evolution.

Links: link

The record appears in these collections:
Conference Contributions & Seminars > Conference Talks > Contributed Talks
Royal Observatory of Belgium > Solar Physics & Space Weather (SIDC)

 Record created 2018-01-29, last modified 2018-01-29