Weekly Report

(last updated 02 Oct 2025 02:01 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 02 OCTOBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (23 SEPTEMBER - 01 OCTOBER) 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 23 Sep 3212 4232 11 24 Sep 1112 3212 6 25 Sep 1122 3112 6 26 Sep 1112 1012 3 27 Sep 1201 1022 3 28 Sep 3212 2322 8 29 Sep 2225 4442 19 30 Sep 3445 5445 33 01 Oct 3343 5343 22 *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. G1 on 29, 30-Sep and on 01-Oct. G0 on all other days. 2. FORECAST (02 OCTOBER - 01 NOVEMBER) Disturbed Periods: 3-5 Oct, 8-Oct, 11-13 Oct, 26-29 Oct Best Quiet Periods: 15-24 Oct 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Mildly disturbed Periods: 13, 28 and 29 Oct Best Quiet Periods: 8-10 Oct, 15-24 Oct Central Australian Regions: Disturbed Periods: 13, 28 and 29 Oct Mildly disturbed: 3-5 Oct, 12-Oct, 14-15 Oct, 20-21 Oct Best Quiet Periods: 15-24 Oct Southern Australian Regions: Disturbed Periods: 3-5 Oct, 12-15 Oct, 20-21 Oct, 28-29 Oct Best Quiet Periods: 15-24 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.