Daily Report
Geomagnetic Summary
(last updated 03 Apr 2026 23:30 UT)
Geomagnetic field for Australian Region 03 Apr: G1 Estimated Indices 03 Apr : A K Australian Region 26 33444544 Cocos Island 18 22433533 Darwin 26 33444544 Townsville 25 33443544 Learmonth - -------- Alice Springs 26 33444544 Gingin 35 33444655 Canberra 30 33443555 Kennaook Cape Grim 34 33544555 Hobart 34 33544555 Estimated Antarctic Regional K Indices 03 Apr : Macquarie Island 64 34555775 Casey 81 45533955 Mawson 78 35555777 Observed Regional daily pc3 Indices 03 Apr : Darwin 19 (Quiet) Townsville 9 (Quiet) Learmonth NA Alice Springs 14 (Quiet) Gingin 106 (Major storm) Canberra 153 (Severe storm) Hobart NA 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 03 Apr : A Fredericksburg 28 Planetary 54 Observed AFr/Ap Indices 02 Apr : A K Fredericksburg 30 Planetary 43 5455 5654
Geomagnetic Forecast
(last updated 03 Apr 2026 23:30 UT)
Date Ap Conditions 04 Apr 33 G1-G2 05 Apr 22 G1 06 Apr 12 G0, chance of G1 COMMENT: ASWFC Geomagnetic Warning 25 was issued on 3 April and is current for 4 Apr only. Geomagnetic conditions in the Australian region reached the G1 level on UT day 03-Apr, coinciding with the arrival of a CME first observed at 01/2229UT. This arrival was noted by the BOM magnetometer, which registered a weak (19 nT) impulse at 03/1528UT. An isolated period of G2 was recorded at Gingin Observatory during this time. G1-G3 geomagnetic conditions were observed in the Antarctic region across UT day 03-Apr, with a single interval of G5 recorded at Casey. G3 geomagnetic conditions were observed at the planetary level during the last 24 hours. G1-G2 geomagnetic conditions are forecast for 04-Apr due to the combined influence of the CME impact and coronal hole high speed wind stream. This will decline to G1 conditions on 05-Apr, and to G0, with a chance of G1 conditions on 06-Apr, as the effects of these events decline.
