Forecasting the Ionosphere from Sparse GNSS Data with Temporal-Fusion Transformers. - Giacomo Acciarini; Simone Mestici; Halil Kelebek; Linnea Wolniewicz; Michael Vergalla; Madhulika Guhathakurta; Umaa Rebbapragada; Bala Poduval; Atilim Günes Baydin; Frank Soboczenski (CoRR, 2025)