Weekly Report

(last updated 26 Feb 2026 03:23 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 26 FEBRUARY 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (17 FEBRUARY - 25 FEBRUARY) 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 Feb 2223 3212 8 18 Feb 2212 2221 6 19 Feb 2221 3211 6 20 Feb 1213 3223 9 21 Feb 3333 2234 14 22 Feb 3445 3433 23 23 Feb 3323 3143 14 In the BOM magnetometer data for 23 Feb, a weak (8nT) impulse was observed at 1336UT. 24 Feb 2323 3222 10 25 Feb 3232 3323 12 *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 22 Feb. Quiet to unsettled on other days. 2. FORECAST (26 FEBRUARY - 28 MARCH) Disturbed Periods: 4-6 Mar, 12 Mar, 14-16 Mar, 22-23 Mar. Best Quiet Periods: 27 Feb, 1-2 Mar, 7-9 Mar. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 26 Feb to 24 Mar. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: None Best Quiet Periods: 1-2 Mar, 7-9-Mar. Southern Australian Regions: Disturbed Periods: 22-23 Mar. Best Quiet Periods: 1-2 Mar, 7-9 Mar. 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.