Weekly Report

(last updated 01 Oct 2026 04:48 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 01 OCTOBER 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (22 SEPTEMBER - 30 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 22 Sep 1100 0100 1 23 Sep 1100 0012 2 24 Sep 2234 3322 12 25 Sep 2233 4223 12 26 Sep 2323 1122 8 27 Sep 2121 2001 3 28 Sep 1000 1100 1 29 Sep 1100 0001 1 30 Sep 1101 1000 1 *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. Quiet to unsettled conditions. 2. FORECAST (01 OCTOBER - 31 OCTOBER) Disturbed Periods: 2 Oct, 22 Oct. Best Quiet Periods: 9-10 Oct, 15-20 Oct, 25-30 Oct. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 01-31 Oct. Central Australian Regions: Disturbed Periods: 13-14 Oct, 22-24 Oct, 31 Oct. Best Quiet Periods: 01-12 Oct, 15-21 Oct, 25-30 Oct. Southern Australian Regions: Disturbed Periods: 13-14 Oct, 22-24 Oct, 31 Oct. Best Quiet Periods: 01-12 Oct, 15-21 Oct, 25-30 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.