TY - GEN T1 - Case studies on pre-eruptive X-class flares using R-value in the lower solar atmosphere T2 - arXiv PY - 2024/08/07 AU - Biswal S AU - Korsós MB AU - Georgoulis MK AU - Nindos A AU - Patsourakos S AU - Erdélyi R ED - Y2 - 2024/12/22 ER -