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HomeGeophysicalSummary and ForecastsWeekly Report Monday, Apr 20 2026 22:42 UT
Summary and Forecasts

Weekly Report

(last updated 16 Apr 2026 01:34 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 16 APRIL 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (07 APRIL - 15 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 07 Apr 2221 1312 6 08 Apr 1213 2122 6 09 Apr 1111 3222 6 10 Apr 3232 4331 13 11 Apr 2333 2311 10 12 Apr 2222 2111 5 13 Apr 1110 0101 1 14 Apr 1100 0000 0 15 Apr 1100 1111 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. G0 conditions observed during the week, with only a mild increase in geomagnetic activity 10-11 Apr. 2. FORECAST (16 APRIL - 16 MAY) Disturbed Periods: 18-20 Apr, 30-Apr to 01-May, 07-May. Best Quiet Periods: 16 Apr, 23-27-Apr, 3-5 May, 10-12 May. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 24-27 April, 05-06 May, 10-13 May. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed: 18-21 Apr, 29-Apr to 03-May, 08-09 May. Best Quiet Periods: 23-27 Apr, 05-06 May. 10-13 May. Southern Australian Regions: Disturbed Periods: 18-21 Apr, 29-Apr to 03-May, 08-09 May. Best Quiet Periods: 23-27 April, 05-06 May, 10-13 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.

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