Exploring small-scale coronal loop structures using ultra high resolution observations from the latest Hi-C sounding rocket campaign

Anna Rankin

Hosted by University of Lancashire, UK on March 12, 2026

Abstract

This work takes advantage of new observational data collected by the High-resolution Coronal Imager (Hi-C) at the highest spatial and temporal resolutions available. This most recent Hi-C dataset is the first to make use of the hot 129 Å channel and the first to consist of targeted observations of a solar flare, rather than the quiescent corona. Images from Hi-C are analysed and compared with complementary EUV observations from SDO/AIA. The widths of the loop strands are measured, and the resulting populations analysed. Preliminary results suggest the majority of loop strands have a width in the range 500-2,000 km, but there is some variation in the loop strand widths observed in plasma at different temperatures. There is some evidence that there are smaller structures present which are partially resolved by Hi-C, with the very smallest smallest loop strands of a similar order of magnitude to the spatial resolution of the Hi-C images. Further results will be presented, as well as a discussion of future work, investigating individual events within the Hi-C observations, making use of the high cadence available to track the dynamic behaviour of the corona.