Daily Report

Geomagnetic Summary

(last updated 17 Apr 2026 23:30 UT)

Geomagnetic field for Australian Region 17 Apr: G0 Estimated Indices 17 Apr : A K Australian Region 1 10000021 Cocos Island 2 11010021 Darwin 3 21100022 Townsville 2 11000022 Learmonth 2 10000031 Alice Springs 1 00000021 Gingin 1 01000021 Canberra 1 10000011 Kennaook Cape Grim 1 10000011 Hobart 0 00000011 Estimated Antarctic Regional K Indices 17 Apr : Macquarie Island 0 00000010 Casey 3 12210011 Mawson 3 11100122 Observed Regional daily pc3 Indices 17 Apr : 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 17 Apr : A Fredericksburg 15 Planetary 20 Observed AFr/Ap Indices 16 Apr : A K Fredericksburg 3 Planetary 3 1111 101-

Geomagnetic Forecast

(last updated 17 Apr 2026 23:30 UT)

Date Ap Conditions 18 Apr 30 G1, chance of G2 19 Apr 25 G1, chance of G2 20 Apr 20 G0-G1 COMMENT: ASWFC Geomagnetic Warning 28 was issued on 15 April and is current for 17-19 Apr. G0 geomagnetic conditions were recorded in the Australian region on 17-Apr, as well as being observed in the Antarctic region, and at the planetary level. G1 geomagnetic conditions, with a chance of G2, are forecast for 18-19 Apr, due to the effects of a coronal hole high speed wind stream that will connect with the Earth on 18-Apr. These conditions will ease to G0-G1 on 20-Apr as these effects begin to wane.