Weekly Report
(last updated 23 Jul 2026 03:43 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 23 JULY 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (14 JULY - 22 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 14 Jul 2211 0112 4 15 Jul 2333 3111 9 16 Jul 1211 2010 3 17 Jul 0110 1100 1 18 Jul 1100 0000 0 19 Jul 0010 0000 0 20 Jul 0010 0000 0 21 Jul 1224 2322 10 In the BOM magnetometer data for 21 Jul, a weak (9nT) impulse was observed at 1102UT. 22 Jul 1323 3112 8 *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 entire period of 14-22 Jul. 2. FORECAST (23 JULY - 22 AUGUST) Disturbed Periods: 23-Jul, 5-6 Aug, 11-Aug, 19-20 Aug. Best Quiet Periods: 26-Jul to 4 Aug, 7-10 Aug, 13-17 Aug, 22 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 24 Jul to 22 Aug. Central Australian Regions: Disturbed Periods: 23-24 Jul, 5-6 Aug, 19-20 Aug. Best Quiet Periods: 26 Jul to 4 Aug, 7-17 Aug, 22-Aug. Southern Australian Regions: Disturbed Periods: 23-24 Jul, 5-6 Aug, 11-Aug, 19-20 Aug. Best Quiet Periods: 26 Jul to 4 Aug, 7-10 Aug, 13-17 Aug, 22-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.
