Weekly Report

(last updated 21 Aug 2025 01:18 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 21 AUGUST 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (12 AUGUST - 20 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 12 Aug 3322 2222 9 13 Aug 2223 3233 11 14 Aug 2222 2211 6 15 Aug 2211 0121 4 16 Aug 1211 0201 3 17 Aug 1111 1100 2 18 Aug 0112 2212 4 19 Aug 2223 3343 13 20 Aug 3223 1112 7 *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 were observed in the Australian region this week. 2. FORECAST (21 AUGUST - 20 SEPTEMBER) Disturbed Periods: 4-7 Sep, 15-16 Sep. Best Quiet Periods: 24-25 Aug, 30 Aug to 2 Sep, 11-14 Sep. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 21 Aug to 20 Sep. Central Australian Regions: Mildly Disturbed Periods: 21-22 Aug, 6-9 Sep, 16-18 Sep. Best Quiet Periods: 24 Aug to 4 Sep, 11-14 Sep, 20 Sep. Southern Australian Regions: Disturbed Periods: 21-22 Aug, 6-9 Sep, 16-18 Sep. Best Quiet Periods: 24 Aug to 4 Sep, 11-14 Sep, 20 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.