Weekly Report

(last updated 31 Jul 2025 02:28 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 31 JULY 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (22 JULY - 30 JULY) 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 22 Jul 1202 2233 7 23 Jul 2334 4233 16 24 Jul 3233 3222 11 25 Jul 2211 1112 4 26 Jul 1112 3322 7 27 Jul 1112 0100 2 28 Jul 1111 1122 4 29 Jul 1232 0001 4 30 Jul 1102 2221 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 geomagnetic conditions were observed throughout the week. 2. FORECAST (31 JULY - 30 AUGUST) Disturbed Periods: 18-19 Aug. Best Quiet Periods: 31-Jul to 6 Aug, 9-17 Aug, 23-30 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 31 Jul to 30 Aug. Central Australian Regions: Disturbed Periods: 18-22 Aug. Best Quiet Periods: 31 Jul to 17 Aug, 24-30 Aug. Southern Australian Regions: Disturbed Periods: 18-23 Aug. Best Quiet Periods: 31 Jul to 6 Aug, 9-17 Aug, 25-30 Aug. 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.