SWS GRAFEX HF FREQUENCY PREDICTIONS ADDRESS NO. 1234 =============================================================================== Circuit: Karratha Perth Date: 31 August, 2024 T-index: 155 Bearings: 184 5 Distance: 1251 km First Mode |--------F r e q u e n c y (MHz)---------| Second Mode 1F 19-25 1E 5 1 5 10 15 20 25 30 35 40 2F 37-45 2E 14 UT OWF EMUF ALF |...|....| ....|....| ....|....| ....|....| OWF EMUF ALF UT 00 17.8 12.5 6.9 SSXMMM MMMFFFF%%. . 11.9 7.7 4.2 00 01 19.3 14.3 7.8 ASSXMM MMMMFFFFF% %.. 13.0 8.8 4.8 01 02 19.5 15.5 8.3 SSSXM MMMMMFFFF% %.. 13.5 9.6 5.1 02 03 19.5 16.2 8.6 SSSXM MMMMMBFFF% %. 13.7 10.0 5.2 03 04 19.2 16.4 8.7 SSSXX MMMMMBFFF% %. 13.7 10.2 5.3 04 05 18.9 16.3 8.7 SSSXX MMMMBBFF%% .. 13.5 10.1 5.3 05 06 18.2 15.9 8.5 SSSXM MMMMBFFF%% . 13.2 9.8 5.2 06 07 17.9 15.0 8.1 ASSSXM MMMMBFF%%. . 13.0 9.3 4.9 07 08 18.0 13.5 7.4 ASSXMM MMMMFFF%%. . 12.9 8.3 4.5 08 09 18.0 11.0 6.2 ASSMMMM MMMFFFF%%. . 12.7 6.8 3.8 09 10 17.1 2.4 0.0 XMMMMMMMMM MMMFFFF%.. 12.0 1.5 0.0 10 11 14.8 2.4 0.0 XMMMMMMMMM MFFF%%. 10.6 1.5 0.0 11 12 12.7 2.4 0.0 XMMMMMMMMM FF%. 9.2 1.5 0.0 12 13 11.5 2.4 0.0 XMMMMMMMMF F%. 8.3 1.5 0.0 13 14 10.3 2.4 0.0 XMMMMMMMFF %.. 7.4 1.5 0.0 14 15 9.1 2.4 0.0 XMMMMMMFF% ... 6.6 1.5 0.0 15 16 8.6 2.4 0.0 XMMMMMMF%% .. 6.3 1.5 0.0 16 17 8.1 2.4 0.0 XMMMMMMF%. .. 6.0 1.5 0.0 17 18 7.5 2.4 0.0 XMMMMMF%%. . 5.6 1.5 0.0 18 19 7.0 2.4 0.0 XMMMMM%%.. 5.2 1.5 0.0 19 20 6.4 2.4 0.0 XMMMMM%%. 4.8 1.5 0.0 20 21 6.1 2.4 0.0 XMMMMF%.. 4.6 1.5 0.0 21 22 7.4 2.4 0.0 XMMMMMF%.. 5.6 1.5 0.0 22 23 13.2 8.9 5.2 SSMMMMM FFF%.. 9.2 5.3 3.3 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) 31-Aug-2024 BoM Space Weather Services, Sydney Australia +61-2-9213-8000