Weekly Report

(last updated 24 Sep 2026 04:12 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 24 SEPTEMBER 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (15 SEPTEMBER - 23 SEPTEMBER) K indices are in UT (0-24). For conversion to local time: AEST = UT + 10 hours; ACST = UT + 9.5 hours; AWST = UT + 8 hours Australian Region* Date K-INDICES A 15 Sep 3310 2023 7 16 Sep 3222 3001 6 17 Sep 2122 4212 8 18 Sep 1211 0002 2 19 Sep 2210 2211 4 20 Sep 1120 0001 2 21 Sep 1100 0001 1 22 Sep 1100 0100 1 23 Sep 1100 0012 2 *estimated from real time 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. G0 geomagnetic conditions in the Australian region on all days this week. 2. FORECAST (24 SEPTEMBER - 24 OCTOBER) Disturbed Periods: 24 Sep, 13-14 Oct, 22-24 Oct. Best Quiet Periods: 28 Sep to 12 Oct, 15-21 Oct. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 24 Sep to 24 Oct. Central Australian Regions: Disturbed Periods: 24 Sep, 13-14 Oct, 22-24 Oct. Best Quiet Periods: 26 Sep to 12 Oct, 15-21 Oct. Southern Australian Regions: Disturbed Periods: 24 Sep, 13-14 Oct, 22-24 Oct. Best Quiet Periods: 28 Sep to 12 Oct, 15-21 Oct. 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. PLEASE NOTE: Geomagnetic activity can frequently be determined by short timescale solar events that cannot be forecast a week in advance, particularly at solar maximum.