Daily Report
Geomagnetic Summary
(last updated 28 Dec 2025 23:30 UT)
Geomagnetic field for Australian Region 28 Dec: G0 Estimated Indices 28 Dec : A K Australian Region 7 22122312 Cocos Island 5 22122211 Darwin 8 31122313 Townsville 7 21122322 Learmonth 9 32132312 Alice Springs 6 21122312 Gingin 9 32132322 Canberra 7 22222312 Kennaook Cape Grim 7 22222312 Hobart 7 22222312 Estimated Antarctic Regional K Indices 28 Dec : Macquarie Island 10 22133411 Casey 26 56433223 Mawson 26 33344355 Observed Regional daily pc3 Indices 28 Dec : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 2 (Quiet) Hobart 10 (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 28 Dec : A Fredericksburg 6 Planetary 7 Observed AFr/Ap Indices 27 Dec : A K Fredericksburg 5 Planetary 7 1322 2122
Geomagnetic Forecast
(last updated 28 Dec 2025 23:30 UT)
Date Ap Conditions 29 Dec 6 G0 30 Dec 20 G1, chance G2 31 Dec 18 G0-G1 COMMENT: ASWFC Geomagnetic Warning 102 was issued on 27 December and is current for 30-31 Dec. G0 geomagnetic conditions were observed in the Australian region on UT day 27-Dec. G0-G2 geomagnetic conditions were observed in the Antarctic region. G0 geomagnetic conditions are expected on 29-Dec. For 30-Dec planetary geomagnetic 27-day recurrence patterns show G3 conditions for the last two rotations due to southward IMF conditions preceding the Earth's entry into a coronal hole wind stream which is expected on 31-Dec. However, the coronal hole on this rotation is smaller and less distinct possibly indicating the southward IMF structure in the solar wind may also be weaker. Planetary G1, chance G2 conditions are forecast for 30-Dec and G0-G1 conditions for 31-Dec. Geomagnetic activity in the Australian region is expected to be G0, chance G1 over 30-31 Dec.
