Daily Report
Geomagnetic Summary
(last updated 27 Dec 2025 23:30 UT)
Geomagnetic field for Australian Region 27 Dec: G0 Estimated Indices 27 Dec : A K Australian Region 5 22211122 Cocos Island 3 12110121 Darwin 6 22211123 Townsville 8 32312122 Learmonth 7 32212122 Alice Springs 5 22211122 Gingin 6 22211132 Canberra 6 23221112 Kennaook Cape Grim 7 23222122 Hobart 7 23222112 Estimated Antarctic Regional K Indices 27 Dec : Macquarie Island 5 12132012 Casey 30 46632233 Mawson 18 34332253 Observed Regional daily pc3 Indices 27 Dec : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 2 (Quiet) Canberra 6 (Quiet) Hobart 18 (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 27 Dec : A Fredericksburg 7 Planetary 7 Observed AFr/Ap Indices 26 Dec : A K Fredericksburg 6 Planetary 8 2222 2311
Geomagnetic Forecast
(last updated 27 Dec 2025 23:30 UT)
Date Ap Conditions 28 Dec 6 G0 29 Dec 6 G0 30 Dec 20 G1, chance G2 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 over 28-29 Dec. For 30-Dec planetary geomagnetic 27-day recurrence patterns show G3 conditions for the last two rotations due to southward IMF conditions preceding a coronal hole wind stream entry. 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. Geomagnetic activity in the Australian region is expected to be G0, chance G1 on 30-31 Dec.
