Weekly Report

(last updated 09 Apr 2026 03:28 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 09 APRIL 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (31 MARCH - 08 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 31 Mar 1212 2111 4 01 Apr 2111 3212 6 In the BOM magnetometer data for 01 Apr, a weak (9nT) impulse was observed at 1203UT. 02 Apr 3344 4543 25 03 Apr 3344 4544 26 In the BOM magnetometer data for 03 Apr, a weak (19nT) impulse was observed at 1528UT. 04 Apr 2222 1132 7 05 Apr 3233 3311 11 06 Apr 1222 2222 6 07 Apr 2221 1312 6 08 Apr 1213 2122 6 *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 Geomagnetic conditions were observed on 02-03 Apr due to combined effects from a glancing coronal mass ejection impact and a coronal hole high speed wind stream. G0 geomagnetic conditions were observed on other days. 2. FORECAST (09 APRIL - 09 MAY) Disturbed Periods: 10-11 Apr, 16-20 Apr, 29-Apr to 01-May, 06-08 May. Best Quiet Periods: 12-14 Apr, 22-27 Apr, 03-05 May. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Mildly Disturbed Periods: None. Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 May. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 10-12 Apr, 18-21 Apr, 29-Apr to 03-May, 07-09 May. Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 May. Southern Australian Regions: Disturbed Periods: 10-12 Apr, 18-21 Apr, 29-Apr to 03-May, 07-09 May. Best Quiet Periods: 13-17 Apr, 22-28 Apr, 04-06 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.