(last updated 30 Nov 2023 00:54 UT)
SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 30 NOVEMBER 2023 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (21 NOVEMBER - 29 NOVEMBER) 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 21 Nov 2333 3323 13 22 Nov 3434 4432 20 23 Nov 1121 1001 2 24 Nov 1111 2223 6 25 Nov 2245 5543 28 In the BOM magnetometer data for 25 Nov, a weak (23nT) impulse was observed at 0835UT. 26 Nov 3231 2012 7 27 Nov 1111 2212 4 28 Nov 2222 1222 6 29 Nov 1111 2011 3 *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 disturbed conditions were observed on 25-Nov due to a CME arrival. A mild increase in geomagnetic activity was observed on 21-22-Nov due to a coronal hole wind stream. 2. FORECAST (30 NOVEMBER - 30 DECEMBER) Disturbed Periods: A strong geomagnetic disturbance G3-G4, is expected from late 30-Nov to 01-Dec due to a sequence of recent CMEs. Mild to moderate disturbances may be experienced on: 4-6 Dec, 19 Dec, 22 Dec. Best Quiet Periods: 7-8 Dec, 13-17 Dec, 23-26 Dec. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: 01-Dec Best Quiet Periods: 03-Dec to 26 Dec. Central Australian Regions: Disturbed Periods: 01-Dec Best Quiet Periods: 04-26 Dec. Southern Australian Regions: Disturbed Periods: 01-Dec, 5-Dec, 7-9 Dec, 19-Dec Best Quiet Periods: 11-18 Dec, 23-26 Dec. 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.