Weekly Report

(last updated 28 Aug 2025 03:47 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 28 AUGUST 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (19 AUGUST - 27 AUGUST) 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 19 Aug 2223 3343 13 20 Aug 3223 1112 7 21 Aug 2211 0231 5 22 Aug 3210 1212 5 23 Aug 1211 0001 2 24 Aug 1210 0111 2 25 Aug 0110 3211 4 26 Aug 2222 1002 4 27 Aug 1111 2212 4 *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 conditions observed in the Australian region for the whole period of 19-27 Aug. 2. FORECAST (28 AUGUST - 27 SEPTEMBER) Disturbed Periods: 4-10 Sep, 15-17 Sep. Best Quiet Periods: 28-29 Aug, 31-Aug to 2-Sep, 12-13 Sep and 20-27 Sep. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: NA Central Australian Regions: Best Quiet Periods: 28-Aug to 7-Sep, 10-15 Sep and 18-27 Sep. Southern Australian Regions: Disturbed Periods: 5-10 Sep, 15-19 Sep. Best Quiet Periods: 28-Aug to 3-Sep, 12-13 Sep and 21-27 Sep. 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.