SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Albany Perth Date: 19 February, 2026 T-index: 95 Bearings: 331 152 Distance: 386 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 51-61 1E 24 1 5 10 15 20 25 30 35 40 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 6.2 5.7 3.3 BBF%.. 00 01 6.6 6.3 3.6 ABB%%.. 01 02 7.0 6.7 3.7 ABB%%.. 02 03 7.5 6.9 3.8 ABBF%%. . 03 04 7.7 7.0 3.9 ABBB%%. . 04 05 7.8 6.9 3.9 ABBF%%. . 05 06 7.7 6.8 3.8 ABBF%%. . 06 07 7.5 6.5 3.6 ABBF%%. . 07 08 7.4 6.0 3.4 BBBF%%. . 08 09 7.2 5.3 3.1 BBFF%%. 09 10 7.0 4.0 2.5 ABFF%%%. 10 11 6.6 0.9 0.0 FFFFFF%%.. 11 12 6.2 0.9 0.0 FFFFFF%.. 12 13 5.8 0.9 0.0 FFFFF%%. 13 14 5.2 0.9 0.0 FFFFF%.. 14 15 5.1 0.9 0.0 FFFFF%. 15 16 5.0 0.9 0.0 FFFF%%. 16 17 4.7 0.9 0.0 FFFF%%. 17 18 4.4 0.9 0.0 FFFF%.. 18 19 4.1 0.9 0.0 FFFF%. 19 20 3.9 0.9 0.0 FFF%.. 20 21 3.8 0.9 0.0 FFF%.. 21 22 4.4 3.1 2.0 ABF%.. 22 23 5.4 4.8 2.9 ABF%.. 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) 19-Feb-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000