Weekly Report

(last updated 28 May 2026 01:40 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 28 MAY 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (19 MAY - 27 MAY) 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 19 May 1244 3432 16 20 May 2210 0001 2 21 May 2220 3121 6 22 May 1222 0002 3 23 May 0010 0000 0 24 May 1110 1021 2 25 May 2111 1221 4 26 May 1110 0013 3 27 May 1221 0212 4 *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 (28 MAY - 27 JUNE) Disturbed Periods: 11-12 Jun. Best Quiet Periods: 2-3 Jun, 5-8 Jun, 10 Jun, 17-20 Jun, 25 Jun. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 28 May to 27 Jun. Central Australian Regions: Mildly Disturbed Periods: 4 Jun, 11-15 Jun. Best Quiet Periods: 28 May to 2 Jun, 6-9 Jun, 17-27 Jun. Southern Australian Regions: Disturbed Periods: 4 Jun, 11-15 Jun. Best Quiet Periods: 28 May to 2 Jun, 6-9 Jun, 17-27 Jun. 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.