Daily Report

Geomagnetic Summary

(last updated 16 Sep 2025 23:30 UT)

Geomagnetic field for Australian Region 16 Sep: G0 Estimated Indices 16 Sep : A K Australian Region 12 33333222 Cocos Island 6 22322111 Darwin 13 33333223 Townsville 13 33343222 Learmonth 13 33333322 Alice Springs 12 33333222 Gingin 13 33333322 Canberra 13 33433222 Kennaook Cape Grim 15 33443222 Hobart 15 33443222 Estimated Antarctic Regional K Indices 16 Sep : Macquarie Island 26 33555332 Casey 19 45433222 Mawson 47 55553366 Observed Regional daily pc3 Indices 16 Sep : Darwin 14 (Quiet) Townsville 4 (Quiet) Learmonth 23 (Quiet to unsettled) Alice Springs 13 (Quiet) Gingin 103 (Major storm) Canberra 107 (Major storm) Hobart 103 (Major storm) Pc3 pulsations are high frequency (10-45 second period) variations of the Earths magnetic field. Daily pc3-indices are the daily sum of 20 minute pc3-indices for that station and have been shown to be well correlated with rejection of high resolution aeromagnetic survey flight-line data. NOTE: Indices may have been generated from data obtained in cooperation with the following organisations: Geoscience Australia, University of Newcastle Space Physics Group, Australian Government Antarctic Division and International Center for Space Weather Science and Education, Japan. Estimated AFr/Ap Indices 16 Sep : A Fredericksburg 17 Planetary 22 Observed AFr/Ap Indices 15 Sep : A K Fredericksburg 34 Planetary 48 7555 5544

Geomagnetic Forecast

(last updated 16 Sep 2025 23:30 UT)

Date Ap Conditions 17 Sep 14 G0, chance of G1 18 Sep 10 G0 19 Sep 10 G0 COMMENT: G0 geomagnetic conditions were observed in the Australian and G1 with isolated G2 conditions in Antarctic regions on UT day 16-Sep. Planetary conditions briefly reached G1 early in the UT day in association with a brief southward IMF conditions during very strong winds due to a coronal hole. The wind stream from this coronal hole is a chance of causing isolated periods of G1 geomagnetic conditions on 17-Sep. G0 conditions are expected on 18-19 Sep.