Daily Report

Geomagnetic Summary

(last updated 19 Oct 2025 23:30 UT)

Geomagnetic field for Australian Region 19 Oct: G0 Estimated Indices 19 Oct : A K Australian Region 12 33322323 Cocos Island 8 32222321 Darwin 13 33322324 Townsville 13 33322333 Learmonth 12 33322323 Alice Springs 12 33322323 Gingin 12 42312323 Canberra 12 33322323 Kennaook Cape Grim 13 33332323 Hobart 13 33332323 Estimated Antarctic Regional K Indices 19 Oct : Macquarie Island 20 43254422 Casey 22 45532323 Mawson 29 54343454 Observed Regional daily pc3 Indices 19 Oct : Darwin 2 (Quiet) Townsville 0 (Quiet) Learmonth 6 (Quiet) Alice Springs 2 (Quiet) Gingin 76 (Active) Canberra 92 (Minor storm) Hobart 100 (Minor storm) 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 19 Oct : A Fredericksburg 16 Planetary 18 Observed AFr/Ap Indices 18 Oct : A K Fredericksburg 20 Planetary 36 4454 3564

Geomagnetic Forecast

(last updated 19 Oct 2025 23:30 UT)

Date Ap Conditions 20 Oct 13 G0, chance of G1 21 Oct 8 G0 22 Oct 5 G0 COMMENT: G0 geomagnetic conditions were observed in the Australian region on UT day 19-Oct. G1 conditions were observed at the planetary level and in the Antarctic region. G0 conditions, with a chance of G1 are expected on 20-Oct and G0 conditions are expected over 21-22 Oct as high speed wind stream effects ease.