Weekly Report
(last updated 11 Dec 2025 01:13 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 11 DECEMBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (02 DECEMBER - 10 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 02 Dec 2221 1222 6 03 Dec 1123 5445 22 04 Dec 3334 4333 18 05 Dec 3332 2232 11 06 Dec 3332 2222 10 07 Dec 2222 2111 5 08 Dec 1210 0011 2 09 Dec 1011 1112 3 10 Dec 2231 2345 16 *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. G1 on 3-Dec due to coronal hole high speed wind stream effects and 10-Dec due to coronal mass ejection arrival. G0 on other days. 2. FORECAST (11 DECEMBER - 10 JANUARY) Disturbed Periods: 11-14 Dec, 22-24 Dec, 30 Dec to 1 Jan. Best Quiet Periods: 16-18 Dec, 4-5 Jan. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Mildly Disturbed Periods: 22-23 Dec. Best Quiet Periods: 15-19 Dec, 29-Dec, 4-6 Jan. Central Australian Regions: Disturbed Periods: 22-23 Dec. Mildly Disturbed Periods: 11-14 Dec, 21 Dec 24-26 Dec, 31-Dec, 01-02 Jan Best Quiet Periods: 16-19 Dec, 29-Dec, 4-6 Jan. Southern Australian Regions: Disturbed Periods: 11-14 Dec, 21-26 Dec, 31-Dec, 01-02 Jan Best Quiet Periods: 16-19 Dec, 29-Dec, 4-6 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.
