Weekly Report

(last updated 16 Jul 2026 04:02 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 16 JULY 2026 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (07 JULY - 15 JULY) 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 Jul 0100 0011 1 08 Jul 1232 2231 8 09 Jul 2124 1333 11 10 Jul 1333 3112 9 11 Jul 1121 1221 4 12 Jul 3234 4331 15 In the BOM magnetometer data for 12 Jul, a weak (11nT) impulse was observed at 1402UT. 13 Jul 1111 2222 5 14 Jul 2211 0112 4 15 Jul 2333 3111 9 *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 in the Australian region over the entire period 09-15 Jul. G1 planetary geomagnetic conditions were observed on 12-Jul due to a glancing coronal mass ejection impact. G0 planetary geomagnetic conditions were observed on other days. 2. FORECAST (16 JULY - 15 AUGUST) Disturbed Periods: 21-23 Jul, 04-06 Aug. Best Quiet Periods: 17-20 Jul, 24-26 Jul, 29-Jul to 03-Aug, 7-11 Aug. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 16-Jul to 11-Aug. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 21-24 Jul, 26-27 Jul, 30-31 Jul, 06-08 Aug Best Quiet Periods: 16-20 Jul, 28-29 Jul, 01-04 Aug, 09-11 Aug. Southern Australian Regions: Disturbed Periods: 21-24 Jul, 26-27 Jul, 30-31 Jul, 06-08 Aug Best Quiet Periods: 16-20 Jul, 28-29 Jul, 01-04 Aug, 09-11 Aug. 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.