SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 12 February, 2026 T-index: 85 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-62 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 5.6 5.7 3.3 BB%%.. 00 01 6.0 6.3 3.5 ABP%.. 01 02 6.4 6.6 3.7 ABB%%.. 02 03 6.9 6.8 3.8 ABB%%.. 03 04 7.1 6.9 3.8 ABBF%%. 04 05 7.2 6.9 3.8 ABBF%%. . 05 06 7.2 6.7 3.7 ABBF%%. . 06 07 7.0 6.4 3.6 ABB%%%. . 07 08 6.9 6.0 3.4 BBB%%.. 08 09 6.7 5.3 3.1 BBF%%.. 09 10 6.5 4.2 2.5 ABFF%%.. 10 11 6.2 0.9 0.0 FFFFFF%%. 11 12 5.9 0.9 0.0 FFFFF%%.. 12 13 5.5 0.9 0.0 FFFFF%%. 13 14 5.0 0.9 0.0 FFFF%%. 14 15 4.9 0.9 0.0 FFFF%%. 15 16 4.8 0.9 0.0 FFFF%%. 16 17 4.6 0.9 0.0 FFFF%.. 17 18 4.3 0.9 0.0 FFFF%. 18 19 4.1 0.9 0.0 FFFF.. 19 20 3.8 0.9 0.0 FFF%.. 20 21 3.8 0.9 0.0 FFF%.. 21 22 4.3 3.4 2.1 BF%.. 22 23 5.0 4.9 2.9 AB%%.. 23 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT =============================================================================== |. USABLE LESS THAN 50% OF DAYS |% USABLE 50% TO 90% OF DAYS | |B BOTH E and F MODES 90% OF DAYS |M MIXED FIRST AND SECOND F MODES | |F FIRST F MODE ONLY |E E-LAYER PROPAGATION |P 90% E and 50-90% F | |S SECOND MODES ONLY |A HIGH ABSORPTION |X COMPLEX MODES | (c) 12-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000