3D evolution of a solar flare thermal X-ray loop-top source D. F. Ryan, S. Laube, B. Nicula, S. Krucker, S. A. Maloney, A. F. Battaglia, A. Warmuth, A. Csillaghy and D. Müller A&A, 681 (2024) A61 Published online: 11 January 2024 DOI: 10.1051/0004-6361/202347212