Daily Report

Geomagnetic Summary

(last updated 08 Dec 2025 23:40 UT)

Geomagnetic field for Australian Region 08 Dec: G0 Estimated Indices 08 Dec : A K Australian Region 2 12100011 Cocos Island 1 12000000 Darwin 3 13200011 Townsville 4 32100012 Learmonth 3 13100011 Alice Springs 2 12100011 Gingin 3 13100011 Canberra 2 12000011 Kennaook Cape Grim 3 13000011 Hobart 2 12000011 Estimated Antarctic Regional K Indices 08 Dec : Casey 10 33322222 Mawson 5 21111132 Observed Regional daily pc3 Indices 08 Dec : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 0 (Quiet) Hobart 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 08 Dec : A Fredericksburg 13 Planetary 18 Observed AFr/Ap Indices 07 Dec : A K Fredericksburg 5 Planetary 9 3432 200-

Geomagnetic Forecast

(last updated 08 Dec 2025 23:40 UT)

Date Ap Conditions 09 Dec 45 G3 10 Dec 18 G0-G1 11 Dec 21 G1, chance G2 COMMENT: ASWFC Geomagnetic Warning 97 was issued on 6 December and is current for 9-10 Dec. Geomagnetic conditions in the Australian and Antarctic regions on UT day 8-Dec were G0. G3 geomagnetic conditions are expected on UT day 9-Dec. This is due to a CME that is expected to arrive early on 9-Dec. G0-G1 geomagnetic conditions are expected on 10-Dec as the geomagnetic field recovers. G1, chance G2 conditions are then expected early on the 11th, due to the arrival of a number of CMEs recently observed.