Daily Report

Geomagnetic Summary

(last updated 27 Oct 2025 23:30 UT)

Geomagnetic field for Australian Region 27 Oct: G0 Estimated Indices 27 Oct : A K Australian Region 4 11101222 Cocos Island 3 11101221 Darwin 5 21011223 Townsville 6 21112223 Learmonth 5 11111232 Alice Springs 3 10001222 Gingin 4 11011222 Canberra 3 10001222 Kennaook Cape Grim 4 11101222 Hobart 4 11101222 Estimated Antarctic Regional K Indices 27 Oct : Macquarie Island 1 01100011 Casey 12 34420123 Mawson 6 22211222 Observed Regional daily pc3 Indices 27 Oct : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 0 (Quiet) Canberra 2 (Quiet) Hobart 8 (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 Oct : A Fredericksburg 10 Planetary 12 Observed AFr/Ap Indices 26 Oct : A K Fredericksburg 4 Planetary 4 1111 0111

Geomagnetic Forecast

(last updated 27 Oct 2025 23:30 UT)

Date Ap Conditions 28 Oct 32 G1 29 Oct 29 G1 30 Oct 11 G0 COMMENT: ASWFC Geomagnetic Warning 82 was issued on 27 October and is current for 28-29 Oct. G0 geomagnetic conditions were observed in the Australian region on UT day 27-Oct. G0 conditions were observed in the Antarctic region. G1 geomagnetic conditions are expected over 28-29 Oct, with G0 conditions expected on 30-Oct. This is due to anticipated coronal hole high speed wind stream effects.