Weekly Report
(last updated 20 Aug 2026 00:44 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 20 AUGUST 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (11 AUGUST - 19 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 11 Aug 0002 2311 4 In the BOM magnetometer data for 11 Aug, a weak (9nT) impulse was observed at 1128UT. 12 Aug 1212 2121 5 13 Aug 1110 0012 2 14 Aug 2223 2221 7 15 Aug 1100 1121 2 16 Aug 1111 0001 1 17 Aug 1111 1222 4 18 Aug 3322 2153 14 19 Aug 2434 2122 12 In the BOM magnetometer data for 19 Aug, a weak (8nT) impulse was observed at 0421UT. *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 geomagnetic conditions were observed in the Australian region on UT day 18-Aug due to coronal hole high speed wind stream effects. Some local stations also recorded G1 conditions on 19-Aug, though the Australian region overall remained at G0. 2. FORECAST (20 AUGUST - 19 SEPTEMBER) Disturbed Periods: 20 Aug, 14-16 Sep. Best Quiet Periods: 22-23 Aug, 25-28 Aug, 1-3 Sep, 5-7 Sep, 9 Sep, 11-12 Sep, 18-19 Sep. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 20 Aug to 19 Sep. Central Australian Regions: Mildly Disturbed Periods: 20-21 Aug, 15-17 Sep. Best Quiet Periods: 23 Aug to 13 Sep, 19 Sep. Southern Australian Regions: Disturbed Periods: 20-21 Aug, 15-17 Sep. Best Quiet Periods: 23 Aug to 13 Sep, 19 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.
