K-Indices for Tromso 12 dec. 2025 4433 4556 13 dec. 2025 6332 1345 14 dec. 2025 3312 2132 15 dec. 2025 2011 3323 16 dec. 2025 3222 2345 17 dec. 2025 3332 3366 18 dec. 2025 5334 255x