Weekly Report
(last updated 24 Apr 2025 00:56 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 24 APRIL 2025 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (15 APRIL - 23 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 15 Apr 2211 2345 14 In the BOM magnetometer data for 15 Apr, a weak (10nT) impulse was observed at 1722UT. 16 Apr 4344 5554 33 17 Apr 2421 3202 9 18 Apr 2222 1222 6 19 Apr 2233 3323 12 20 Apr 3221 1022 6 21 Apr 3344 4332 18 22 Apr 2221 1222 6 23 Apr 1212 2111 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. G1 conditions observed from 15-16 Apr due to the arrival of a coronal mass ejection. G0 conditions on other days. A mild increase in geomagnetic activity was observed on 21-Apr due to a coronal hole wind stream. 2. FORECAST (24 APRIL - 24 MAY) Disturbed Periods: 01-02 May, 06 May, 18-May. Best Quiet Periods: 26-28 Apr, 8-11 May, 16-May, 23-24 May. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 24 Apr to 19 May. Central Australian Regions: Disturbed Periods: None. Best Quiet Periods: 27-29 Apr, 07-11 May, 14-17 May Southern Australian Regions: Disturbed Periods: 24-25 Apr, 01-05 May, 13-May, 18-19 May Best Quiet Periods: 27-29 Apr, 07-11 May, 14-17 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.
