Weekly Report

(last updated 27 Nov 2025 01:56 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 27 NOVEMBER 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (18 NOVEMBER - 26 NOVEMBER) 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 18 Nov 2210 0001 2 19 Nov 1010 1121 2 20 Nov 1211 1223 6 21 Nov 2311 1232 7 22 Nov 2111 2122 5 23 Nov 2132 2322 8 24 Nov 2333 4433 17 25 Nov 3335 4433 22 26 Nov 3333 5322 17 *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 conditions were observed in the Australian region on 25-26 Nov, G0 otherwise. 2. FORECAST (27 NOVEMBER - 27 DECEMBER) Disturbed Periods: 27 Nov, 2-5 Dec, 21-23 Dec. Best Quiet Periods: 8-17 Dec, 19-20 Dec. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: 9 Dec. Best Quiet Periods: 27 Nov to 8 Dec, 10-21 Dec. Central Australian Regions: Disturbed Periods: 9 Dec. Best Quiet Periods: 27 Nov to 8 Dec, 11-21 Dec. Southern Australian Regions: Disturbed Periods: 4 Dec, 9-10 Dec, 23 Dec. Best Quiet Periods: 28 Nov to 2 Dec, 8 Dec, 11-12 Dec, 14-20 Dec. 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.