Weekly Report

(last updated 19 Dec 2024 01:16 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 19 DECEMBER 2024 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (10 DECEMBER - 18 DECEMBER) 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 10 Dec 2222 1112 5 11 Dec 2121 2112 5 12 Dec 1121 1111 3 13 Dec 1111 2201 3 14 Dec 2122 2223 7 15 Dec 2223 3222 9 16 Dec 1322 1233 9 17 Dec 2555 5533 34 In the BOM magnetometer data for 17 Dec, a weak (23nT) impulse was observed at 0916UT, a weak (36nT) impulse was observed at 1227UT and a weak (40nT) impulse was observed at 1502UT. 18 Dec 3232 3332 12 *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 geomagnetic storm on 17 Dec. G0 on other days. 2. FORECAST (19 DECEMBER - 18 JANUARY) Disturbed Periods: No strong recurrent patterns, however mild activity may be experienced on: 22 Dec, 30 Dec, 5 Jan, 11-12 Jan. Best Quiet Periods: 20-21 Dec, 24-29 Dec, 31 Dec to 4 Jan, 6-9 Jan, 14 Jan. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: None. Best Quiet Periods: 20 Dec to 10 Jan. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: None. Best Quiet Periods: 24-29 Dec, 31-Dec to 9-Jan Southern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 20-21 Dec, 24-29 Dec, 31 Dec to 4 Jan, 6-9 Jan, 14 Jan. 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.