Weekly Report

(last updated 18 Jun 2026 04:03 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 18 JUNE 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (09 JUNE - 17 JUNE) 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 09 Jun 1112 2232 6 10 Jun 1102 3001 3 11 Jun 0222 2243 9 12 Jun 2333 3122 10 13 Jun 2324 3222 11 14 Jun 1112 0201 3 15 Jun 1110 0001 1 16 Jun 2111 1110 3 17 Jun 1222 2100 4 *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 geomagnetic conditions were observed over the entire period of 09-17 Jun. 2. FORECAST (18 JUNE - 18 JULY) Disturbed Periods: 23-26 Jun, 08-09 Jul. Best Quiet Periods: 18-21 Jun, 27-Jun to 06-Jul, 11-18 Jul. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: No Significantly Disturbed Periods Expected Central Australian Regions: Mildly Disturbed Periods: 09-11 Jul. Best Quiet Periods: 19-23 Jun, 28-Jun to 07-Jul, 12-18 Jul. Southern Australian Regions: Disturbed Periods: 09-11 Jul. Best Quiet Periods: 19-23 Jul, 29-Jun to 07-Jul, 13-18 Jul. 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.