Weekly Report
(last updated 30 Jul 2026 04:34 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 30 JULY 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (21 JULY - 29 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 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 23 Jul 2223 2433 12 24 Jul 3210 0001 3 25 Jul 1111 1220 3 26 Jul 1212 0001 2 27 Jul 1111 0112 3 28 Jul 1122 1221 5 29 Jul 1211 0000 2 *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 were reported in the Australian region throughout the entire week. Local G1 conditions were observed at Learmonth on 23-Jul, and at the planetary level on 23-Jul. G0 planetary conditions were observed on all other days this week. 2. FORECAST (30 JULY - 29 AUGUST) Disturbed Periods: 04-06 Aug, 17-19 Aug. Best Quiet Periods: 30-31 Jul, 1-3 Aug, 07-16 Aug, 21-29 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 30 Jul to 25 Aug. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 06-08 Aug, 19-21 Aug. Best Quiet Periods: 30-Jul to 03-Aug, 10-16 Aug, 22-25 Aug. Southern Australian Regions: Disturbed Periods: 06-08 Aug, 19-21 Aug. Best Quiet Periods: 30-Jul to 03-Aug, 10-16 Aug, 22-25 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.
