Geophysical
FORECAST SOL: Normal green MAG: Moderate yellow ION: Normal green
HomeGeophysicalSummary and ForecastsWeekly Report Thursday, Sep 17 2026 13:47 UT
Summary and Forecasts

Weekly Report

(last updated 17 Sep 2026 01:31 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 17 SEPTEMBER 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (08 SEPTEMBER - 16 SEPTEMBER) 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 08 Sep 3235 5332 21 09 Sep 1212 2322 7 10 Sep 1113 3102 6 11 Sep 1222 2212 6 12 Sep 2222 2111 5 13 Sep 2220 2101 4 14 Sep 2222 2323 9 15 Sep 3310 2023 7 16 Sep 3222 3001 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 on 8 Sep in the Australian region. G0 on all other days. 2. FORECAST (17 SEPTEMBER - 17 OCTOBER) Disturbed Periods: 17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct Best Quiet Periods: 18-23 Sep, 26-Sep to 2-Oct, 8-10 Oct 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 18-23 Sep, 24-Sep to 2-Oct, 8-10 Oct Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct. Best Quiet Periods: 18-23 Sep, 26-Sep to 2-Oct, 8-10 Oct. Southern Australian Regions: Disturbed Periods: 17-Sep, 24-25 Sep, 4-5 Oct, 11-12 Oct. Quiet Periods: 18-23 Sep, 26-Sep to 2-Oct, 8-10 Oct. 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.

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