Weekly Report

(last updated 17 Oct 2024 00:41 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 17 OCTOBER 2024 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (08 OCTOBER - 16 OCTOBER) 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 08 Oct 4444 3323 20 09 Oct 3333 4212 13 10 Oct 1112 4767 50 In the BOM magnetometer data for 10 Oct, a moderate (73nT) impulse was observed at 1515UT. 11 Oct 6467 5423 53 12 Oct 4235 4322 19 In the BOM magnetometer data for 12 Oct, a weak (9nT) impulse was observed at 1715UT. 13 Oct 1002 1111 2 14 Oct 1110 1223 5 15 Oct 2232 3323 11 16 Oct 2222 3323 10 *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. A severe geomagnetic disturbance was observed over 10 and 11-Oct due to a CME arrival. Predominately planetary G4 conditions were observed from 10/1500UT until 11/0900UT. One period of planetary G5 was observed 10/2100-2400UT (US SWPC planetary Kp index reached 8 and 2/3 or 9-). This was the strongest disturbance observed during the week and was associated with R3 flare activity on 09-Oct. In the Australian region geomagnetic activity was at G3 on 10-Oct and 11-Oct, and at G1 briefly on 12-Oct for one K-index period. 2. FORECAST (17 OCTOBER - 16 NOVEMBER) Disturbed Periods: Mild disturbance on 19 Oct and 21-22 Oct. Best Quiet Periods: 23-25 Oct, 27-Oct to 01-Nov, 13-Nov to 15-Nov. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 17-Oct to 5-Nov, 4-12 Nov. Central Australian Regions: Disturbed Periods: None. Best Quiet Periods: 17-Oct to 2 Nov, 4-5 Nov, 8-12 Nov. Southern Australian Regions: Disturbed Periods: 3 Nov, 6-7 Nov. Best Quiet Periods: 21-Oct to 2-Nov, 4-5 Nov, 9-12 Nov. 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.