Weekly Report

(last updated 26 Mar 2026 01:17 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 26 MARCH 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (17 MARCH - 25 MARCH) 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 17 Mar 2110 0001 2 18 Mar 1111 0001 1 19 Mar 0110 1000 1 20 Mar 2334 3345 21 In the BOM magnetometer data for 20 Mar, a weak (9nT) impulse was observed at 0226UT, a weak (10nT) impulse was observed at 0401UT and a weak (9nT) impulse was observed at 1527UT. 21 Mar 5554 4222 27 22 Mar 3436 5643 38 23 Mar 3324 4443 20 24 Mar 2334 3222 12 25 Mar 2243 1121 9 In the BOM magnetometer data for 25 Mar, a weak (8nT) impulse was observed at 0631UT. *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. Active on 20-21 Mar, 23 Mar. Minor storm on 22 Mar. Quiet to unsettled on other days. 2. FORECAST (26 MARCH - 25 APRIL) Disturbed Periods: 3-4 Apr, 8-12 Apr, 16-20 Apr Best Quiet Periods: 26-27 Mar, 31-Mar, 1-Apr, 6-7 Apr, 13-15 Apr 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 26-27 Mar, 31-Mar to 2-Apr, 5-8 Apr, 12-15 Apr Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 3-4 Apr, 8-12 Apr, 16-20 Apr Best Quiet Periods: 26-27 Mar, 31-Mar to 1-Apr, 6-7 Apr, 13-15 Apr Southern Australian Regions: Disturbed Periods: 3-4 Apr, 8-12 Apr, 16-20 Mar Best Quiet Periods: 31-Mar to 1-Apr, 6-7 Apr, 12-15 Apr 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.