SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 19 May, 2026 T-index: 40 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-14 1E 2 1 5 10 15 20 25 30 35 40 2F 27-31 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.0 12.0 6.9 SSXMMM MBFF%%%... . 9.7 7.6 4.2 00 01 16.6 14.0 7.9 ASSXXM MMBBFF%%%. ... 10.7 9.1 4.7 01 02 15.9 15.2 8.4 ASSSXM MMBBB%%%%. .... 10.8 9.9 5.0 02 03 15.1 15.8 8.7 SSSXX MMMBB%%%%. .... 10.1 10.4 5.1 03 04 14.9 16.0 8.8 SSSXX MMBBPP%%%. .... 9.9 10.6 5.2 04 05 14.5 15.9 8.7 SSSXX MMBBP%%%%. ... 9.9 10.5 5.1 05 06 15.0 15.3 8.4 ASSSXX MMBBP%%%%. .... 10.0 10.1 4.9 06 07 15.4 14.2 7.9 ASSXXM MMBBF%%%%. ..... 10.0 9.4 4.6 07 08 14.9 12.3 7.0 SSXXMM MMFF%%%%%. .... 9.8 8.2 4.1 08 09 13.4 8.6 5.2 ASSMMMMM MFF%%%%... .. 9.1 5.7 3.0 09 10 10.1 2.0 0.0 XMMMMMMMFF %%%.... 7.2 1.4 0.0 10 11 8.2 2.0 0.0 XMMMMMMF%% ..... 5.6 1.4 0.0 11 12 6.9 2.0 0.0 XMMMMM%%%. .. 4.9 1.4 0.0 12 13 6.6 2.0 0.0 XMMMMF%%.. .. 4.6 1.4 0.0 13 14 6.5 2.0 0.0 XMMMMF%%.. .. 4.6 1.4 0.0 14 15 6.2 2.0 0.0 XMMMMF%%.. . 4.7 1.4 0.0 15 16 6.4 2.0 0.0 XMMMMM%%.. .. 4.7 1.4 0.0 16 17 6.3 2.0 0.0 XMMMMF%%.. . 4.6 1.4 0.0 17 18 6.0 2.0 0.0 XMMMMM%%.. .. 4.4 1.4 0.0 18 19 5.6 2.0 0.0 XMMMM%%%.. .. 4.0 1.4 0.0 19 20 5.4 2.0 0.0 XMMMM%%%.. .. 3.7 1.4 0.0 20 21 4.9 2.0 0.0 XMMMM%%... . 3.6 1.4 0.0 21 22 6.0 2.0 0.0 XMMMM%%%.. 4.5 1.4 0.0 22 23 11.7 7.9 4.9 SMMMMFF F%%... 7.4 3.7 3.2 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-May-2026 BoM Space Weather Services, Sydney Australia +61-2-9213-8000