Daily Report
Geomagnetic Summary
(last updated 15 Sep 2025 23:30 UT)
Geomagnetic field for Australian Region 15 Sep: G1 Estimated Indices 15 Sep : A K Australian Region 25 54444333 Cocos Island 16 43333333 Darwin 29 55444334 Townsville 25 54444333 Learmonth 29 54435443 Alice Springs 30 55445333 Gingin 28 54344444 Canberra 22 44444333 Kennaook Cape Grim 30 54455333 Hobart 30 54455333 Estimated Antarctic Regional K Indices 15 Sep : Macquarie Island 57 55666554 Casey 30 46444343 Mawson 50 75544355 Observed Regional daily pc3 Indices 15 Sep : Darwin 27 (Quiet to unsettled) Townsville 17 (Quiet) Learmonth 26 (Quiet to unsettled) Alice Springs 19 (Quiet) Gingin 113 (Major storm) Canberra 105 (Major storm) Hobart 142 (Severe 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 15 Sep : A Fredericksburg 32 Planetary 51 Observed AFr/Ap Indices 14 Sep : A K Fredericksburg 12 Planetary 14 2232 2235
Geomagnetic Forecast
(last updated 15 Sep 2025 23:30 UT)
Date Ap Conditions 16 Sep 23 G0-G1 17 Sep 17 G0, chance of G1 18 Sep 12 G0 COMMENT: ASWFC Geomagnetic Warning 69 was issued on 15 September and is current for 15-16 Sep. G1 geomagnetic conditions were observed in the Australian and G2 with isolated G3 conditions in Antarctic regions on UT day 15-Sep. Planetary conditions briefly reached G3 early in the UT day in association with southward IMF conditions as the Earth entered a coronal hole high speed wind stream. The wind stream from this coronal hole may cause periods of G1 geomagnetic conditions on 16-Sep. G0, chance of G1 is expected over 17-Sep. G0 conditions are expected on 18-Sep.
