SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Broome Perth Date: 17 May, 2025 T-index: 90 Bearings: 201 24 Distance: 1680 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 12-15 1E 2 1 5 10 15 20 25 30 35 40 2F 28-32 2E 10 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 18.5 12.9 7.6 ASSXMM MMMFFFFF%% %.... 11.6 8.2 4.6 00 01 21.2 15.0 8.6 SSSXM MMMMMFFFFF F%%%..... 13.1 9.7 5.1 01 02 21.0 16.2 9.2 ASSSX MMMMMBFFFF %%%%..... 13.6 10.6 5.5 02 03 20.7 16.9 9.5 ASSSX XMMMMBFFFF %%%%..... 13.3 11.1 5.6 03 04 20.2 17.1 9.7 ASSSX XMMMMBBFFF %%%..... 12.9 11.3 5.7 04 05 19.7 16.9 9.6 ASSSX XMMMBBFFF% %%%..... 12.9 11.2 5.6 05 06 19.6 16.3 9.3 SSSSX MMMMMBFFF% %%%..... 12.6 10.8 5.4 06 07 19.9 15.1 8.7 SSSXM MMMMMFFFF% %%%...... 12.8 10.0 5.1 07 08 19.8 13.2 7.8 ASSXMM MMMMMFFFF% %%%...... 12.8 8.8 4.5 08 09 18.5 9.3 5.8 SSXMMMM MMMMFFFF%% %%..... 12.1 6.2 3.4 09 10 14.6 2.4 0.0 XMMMMMMMMM MFFF%%%%.. ... 9.9 1.6 0.0 10 11 11.8 2.4 0.0 XMMMMMMMMF F%%%%..... . 7.8 1.6 0.0 11 12 9.7 2.4 0.0 XMMMMMMMF% %%..... 6.5 1.6 0.0 12 13 8.6 2.4 0.0 XMMMMMMF%% %.... 5.8 1.6 0.0 13 14 7.8 2.4 0.0 XMMMMMF%%% .... 5.6 1.6 0.0 14 15 7.1 2.4 0.0 XMMMMMF%%. ... 5.3 1.6 0.0 15 16 7.1 2.4 0.0 XMMMMMF%%. ... 5.3 1.6 0.0 16 17 6.8 2.4 0.0 XMMMMM%%%. .. 5.1 1.6 0.0 17 18 6.6 2.4 0.0 XMMMMM%%%. ... 4.8 1.6 0.0 18 19 6.2 2.4 0.0 XMMMMM%%%. ... 4.4 1.6 0.0 19 20 5.9 2.4 0.0 XMMMM%%%.. .. 4.1 1.6 0.0 20 21 5.6 2.4 0.0 XMMMM%%%.. . 4.2 1.6 0.0 21 22 6.9 2.4 0.0 XMMMMM%%%. . 4.9 1.6 0.0 22 23 14.4 8.6 5.4 ASMMMMF FFFF%%... 8.6 4.3 3.6 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) 17-May-2025 BoM Space Weather Services, Sydney Australia +61-2-9213-8000