Weekly Report

(last updated 30 Apr 2026 01:59 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 30 APRIL 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (21 APRIL - 29 APRIL) 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 21 Apr 3312 3431 12 22 Apr 1101 1011 2 23 Apr 1211 1101 3 24 Apr 2121 1222 5 25 Apr 2211 0132 5 26 Apr 2323 0022 7 27 Apr 2211 2101 4 28 Apr 0010 0010 0 29 Apr 0000 2101 1 *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 (30 APRIL - 30 MAY) Disturbed Periods: 7-9 May, 15-18 May. Best Quiet Periods: 1-2 May, 5-6 May, 10-14 May, 19-20 May, 24-26 May. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 30 Apr to 30 May. Central Australian Regions: Mildly Disturbed Periods: 8-9 May, 18 May. Best Quiet Periods: 30 Apr to 6 May, 11-16 May, 20-30 May. Southern Australian Regions: Disturbed Periods: 8-9 May, 18 May. Best Quiet Periods: 30 Apr to 6 May, 11-16 May, 20-30 May. 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.