Weekly Report
(last updated 25 Dec 2025 01:04 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 25 DECEMBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (16 DECEMBER - 24 DECEMBER) 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 16 Dec 3222 2322 9 17 Dec 3222 3233 11 18 Dec 3233 2322 11 19 Dec 2211 1222 5 20 Dec 1121 2122 5 21 Dec 2334 4334 18 22 Dec 3233 4323 14 23 Dec 2333 4333 15 24 Dec 3333 3333 15 *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 in the Australian region this week. 2. FORECAST (25 DECEMBER - 24 JANUARY) Disturbed Periods: 25-27 Dec, 30-31 Dec, 6-8 Jan, 13-14 Jan, 17-23 Jan. Best Quiet Periods: 4-5 Jan, 10-11 Jan, 15-16 Jan. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Mildly Disturbed Periods: 18 Jan. Best Quiet Periods: 25 Dec to 16 Jan, 20-25 Jan. Central Australian Regions: Disturbed Periods: 18 Jan. Mildly Disturbed Periods: 25-27 Dec, 31 Dec to 02 Jan, 9-10 Jan, 12-15 Jan, 17 Jan, 19-23 Jan. Best Quiet Periods: 29 Dec, 4-7 Jan. Southern Australian Regions: Disturbed Periods: 25-27 Dec, 31 Dec to 02 Jan, 9-10 Jan, 12-15 Jan, 17-23 Jan. Best Quiet Periods: 29 Dec, 4-7 Jan. 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.
