SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: PortHedlandPerth Date: 22 October, 2024 T-index: 140 Bearings: 191 12 Distance: 1323 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 18-27 1E 4 1 5 10 15 20 25 30 35 40 2F 36-48 2E 13 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 15.4 14.1 7.7 ASSXMM MBBBF%%.. 10.4 8.5 4.5 00 01 15.9 15.6 8.4 ASSSXM MMBBB%%%.. 10.7 9.4 4.9 01 02 15.8 16.5 8.8 SSSXM MMBBBP%%.. 11.0 10.0 5.2 02 03 16.2 17.1 9.1 SSSSX MMMBBBP%.. 11.5 10.4 5.3 03 04 16.6 17.3 9.2 SSSSX MMMBBBP%%. . 11.7 10.5 5.4 04 05 16.6 17.2 9.1 SSSSX MMMBBBP%%. . 11.9 10.5 5.4 05 06 16.3 16.8 8.9 SSSXX MMMBBB%%.. . 11.8 10.2 5.2 06 07 15.8 16.0 8.6 ASSSXM MMMBBP%%.. 11.3 9.7 5.0 07 08 15.3 14.7 8.0 ASSXMM MMBBF%%.. 11.0 9.0 4.7 08 09 15.7 12.8 7.1 SSSMMM MMFFF%%%.. 11.0 7.8 4.2 09 10 15.3 9.4 5.5 SSMMMMM MMFFF%%.. 10.8 5.5 3.3 10 11 14.6 2.4 0.0 XMMMMMMMMM MFFF%%.. 10.3 1.5 0.0 11 12 13.6 2.4 0.0 XMMMMMMMMM FFF%%.. 9.6 1.5 0.0 12 13 12.9 2.4 0.0 XMMMMMMMMM FF%%.. 9.0 1.5 0.0 13 14 12.0 2.4 0.0 XMMMMMMMMF F%%%.. 8.3 1.5 0.0 14 15 11.1 2.4 0.0 XMMMMMMMMF F%%.... 7.7 1.5 0.0 15 16 10.5 2.4 0.0 XMMMMMMMFF %%.... 7.3 1.5 0.0 16 17 9.9 2.4 0.0 XMMMMMMMF% %%... 7.0 1.5 0.0 17 18 9.0 2.4 0.0 XMMMMMMM%% %.. 6.6 1.5 0.0 18 19 8.2 2.4 0.0 XMMMMMMF%% . 6.1 1.5 0.0 19 20 7.8 2.4 0.0 XMMMMMM%%. . 5.9 1.5 0.0 20 21 8.3 2.4 0.0 XMMMMMMF%% . 6.1 1.5 0.0 21 22 11.1 6.7 4.2 SSMMMMMF F%%.. 7.7 4.1 2.4 22 23 14.3 11.8 6.7 ASSXMMM BFFF%%.. 9.4 7.1 3.9 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) 22-Oct-2024 BoM Space Weather Services, Sydney Australia +61-2-9213-8000