Weekly Report
(last updated 23 Apr 2026 02:39 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 23 APRIL 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (14 APRIL - 22 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 14 Apr 1100 0000 0 15 Apr 1100 1111 2 16 Apr 0100 0011 1 17 Apr 1000 0022 2 18 Apr 2454 3332 20 19 Apr 3343 2321 13 20 Apr 1233 3442 14 21 Apr 3312 3431 12 22 Apr 1101 1011 2 *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. Geomagnetic conditions in the Australian region reached the G1 level on 18-Apr due to a coronal hole high speed wind stream. G0 was observed on other days. 2. FORECAST (23 APRIL - 23 MAY) Disturbed Periods: 29-Apr to 02-May, 06-08 May, 15-18 May. Best Quiet Periods: 27 Apr, 04-05 May, 10-14 May, 20-21 May 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 23-Apr to 23-May. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 29-Apr to 03-May, 08-09 May, 18-May. Best Quiet Periods: 23-28 Apr, 04-07 May, 10-17 May, 19-23 May. Southern Australian Regions: Disturbed Periods: 29-Apr to 03-May, 08-09 May, 18-May. Best Quiet Periods: 24-28 Apr, 2-7 May, 10-15 May, 17-19 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.
