Weekly Report
(last updated 17 Jul 2025 00:57 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 17 JULY 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (08 JULY - 16 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 08 Jul 2322 1312 8 09 Jul 2212 2212 6 10 Jul 1100 0000 1 11 Jul 2223 3232 10 12 Jul 2233 3212 9 13 Jul 3433 3222 13 14 Jul 2231 3232 9 15 Jul 3334 2211 11 16 Jul 2324 1123 10 *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. The Australian regional geomagnetic field was at the G0 level all week, with a mild increase in geomagnetic activity from 11-Jul due to a coronal hole wind stream. Isolated periods of planetary G1 conditions were observed during te interval 13-16 Jul. 2. FORECAST (17 JULY - 16 AUGUST) Disturbed Periods: 17-18 Jul, 22-24 Jul, 31-Jul to 2-Aug, 7 Aug. Best Quiet Periods: 26-29 Jul, 5-6 Aug, 15-16 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 17 Jul to 16 Aug. Central Australian Regions: Disturbed Periods: 23-26 Jul, 9-12 Aug Best Quiet Periods: 20-Jul, 30-Jul to 01-Aug, 6-7 Aug, 15-16 Aug. Southern Australian Regions: Disturbed Periods: 23-26 Jul, 9-12 Aug. Best Quiet Periods: 30-Jul to 01-Aug, 15-16 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.
