Daily Report
Geomagnetic Summary
(last updated 19 Apr 2026 23:30 UT)
Geomagnetic field for Australian Region 19 Apr: G2 Estimated Indices 19 Apr : A K Australian Region 12 33432320 Cocos Island 6 22312210 Darwin 12 33432221 Townsville 12 33432221 Learmonth 13 33432321 Alice Springs 11 33432220 Gingin 12 32343320 Canberra 15 33532320 Kennaook Cape Grim 18 24543320 Hobart 15 34442320 Estimated Antarctic Regional K Indices 19 Apr : Macquarie Island 28 34564330 Casey 14 43332411 Mawson 60 55743656 Observed Regional daily pc3 Indices 19 Apr : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 21 (Quiet to unsettled) Canberra 38 (Quiet to unsettled) Hobart 24 (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 19 Apr : A Fredericksburg 18 Planetary 26 Observed AFr/Ap Indices 18 Apr : A K Fredericksburg 24 Planetary 33 ---- ----
Geomagnetic Forecast
(last updated 19 Apr 2026 23:30 UT)
Date Ap Conditions 20 Apr 20 G0, chance of G1 21 Apr 15 G0 22 Apr 12 G0 COMMENT: Geomagnetic conditions in the Australian region were at the G0 level throughout 19-Apr. A G1 interval was observed at Cape Grim. G2 geomagnetic conditions were reported at the planetary level, with an isolated G3 interval reported in the Antarctic region at Mawson. These geomagnetic conditions are due to an ongoing coronal hole high speed wind stream. The effects of this wind stream are expected to wane, with G0 geomagnetic conditions, with a chance of G1, are forecast for 20-Apr. This will decline further to G0 conditions over 21-22 Apr as this high speed wind stream moves past a geoeffective position.
