Daily Report

Geomagnetic Summary

(last updated 20 May 2025 23:32 UT)

Geomagnetic field for Australian Region 20 May: G0 Estimated Indices 20 May : A K Australian Region 11 23333222 Cocos Island 5 22222111 Darwin 10 23323222 Townsville 11 23333222 Learmonth 11 23333222 Alice Springs 10 23333212 Gingin 10 23233222 Canberra 8 13323211 Kennaook Cape Grim 11 23333222 Hobart 10 23333221 Estimated Antarctic Regional K Indices 20 May : Macquarie Island 12 13344211 Casey 13 44332212 Mawson 34 26634235 Observed Regional daily pc3 Indices 20 May : Darwin 9 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 2 (Quiet) Gingin 7 (Quiet) Canberra 24 (Quiet to unsettled) Hobart 35 (Quiet to unsettled) 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 20 May : A Fredericksburg Planetary Observed AFr/Ap Indices 19 May : A K Fredericksburg Planetary 9 3322 2222

Geomagnetic Forecast

(last updated 20 May 2025 23:32 UT)

Date Ap Conditions 21 May 14 G0, chance of G1 22 May 12 G0 23 May 12 G0 COMMENT: G0 geomagnetic conditions were observed in the Australian region on UT day 20-May. Mostly G0 geomagnetic conditions were observed in the Antarctic region, with isolated periods of G1-G2 observed at Mawson. G0 geomagnetic conditions are expected over 21-23 May, with a chance of G1 on 21-May due to coronal hole high speed wind stream effects from a southern hemisphere coronal hole.