Weekly Report
(last updated 04 Sep 2025 02:43 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 04 SEPTEMBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (26 AUGUST - 03 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 26 Aug 2222 1002 4 27 Aug 1111 2212 4 28 Aug 2122 0012 4 29 Aug 2211 1122 5 30 Aug 1122 1322 6 31 Aug 2211 1111 4 01 Sep 1210 0235 10 In the BOM magnetometer data for 01 Sep, a weak (45nT) impulse was observed at 2059UT. 02 Sep 5454 3454 33 03 Sep 2222 1021 5 *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-G2 geomagnetic conditions were observed in the Australian region on 01-03 Sep due to arrival of a M2.8 CME occurring on 30 Aug. G0 conditions were observed on 26-31 Aug. 2. FORECAST (04 SEPTEMBER - 04 OCTOBER) Disturbed Periods: 05-10 Sep, 15-17 Sep, 29 Sep-03 Oct. Best Quiet Periods: 04 Sep, 11-14 Sep, 18-28 Sep, 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 4 Sep to 4 Oct. Central Australian Regions: Mildly Disturbed Periods: 05-10 Sep, 16 Sept, 18th Sep, 29 Sep. Best Quiet Periods: 04 Sep, 10-15 Sep, 17 Sep, 19-28 Sep, 30 Sep - 03 Oct. Southern Australian Regions: Disturbed Periods: 05-10 Sep, 16 Sept, 18th Sep, 29 Sep. Best Quiet Periods: 04 Sep, 10-15 Sep, 17 Sep, 19-28 Sep, 30 Sep - 03 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.
