Daily Report

Geomagnetic Summary

(last updated 20 Sep 2026 23:30 UT)

Geomagnetic field for Australian Region 20 Sep: G0 Estimated Indices 20 Sep : A K Australian Region 2 11200001 Cocos Island 1 21100000 Darwin 3 12200002 Townsville 2 12200011 Learmonth 1 11100001 Alice Springs 1 01200001 Gingin 1 11100001 Canberra 1 01200001 Kennaook Cape Grim 2 12200001 Hobart 2 12200001 Estimated Antarctic Regional K Indices 20 Sep : Casey 6 33310001 Mawson 21 53321006 Observed Regional daily pc3 Indices 20 Sep : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 0 (Quiet) 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 20 Sep : A Fredericksburg 6 Planetary 6 Observed AFr/Ap Indices 19 Sep : A K Fredericksburg 6 Planetary 7 2321 2222

Geomagnetic Forecast

(last updated 20 Sep 2026 23:30 UT)

Date Ap Conditions 21 Sep 4 G0 22 Sep 7 G0 23 Sep 18 G0, chance of G1 COMMENT: Geomagnetic conditions in the Australian region were at the G0 level over 20-Sep, with G0 conditions also recorded at the planetary scale. Mostly G0 conditions were reported in the Antarctic region, with some G1-G2 intervals observed at Mawson. G0 conditions are forecast over 21-23 Sep, with a chance of G1 on 23-Sep due to high speed wind stream effects of an equatorial coronal hole.