Weekly Report

(last updated 25 May 2023 01:39 UT)

SUBJ: ASWFC WEEKLY GEOPHYSICAL REPORT ISSUED ON 25 MAY 2023 FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx 1. SUMMARY (16 MAY - 24 MAY) 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 16 May 2221 1111 4 17 May 1110 0001 1 18 May 1100 0000 0 19 May 1111 1223 5 20 May 4344 2322 16 21 May 2211 3344 13 22 May 3333 3233 14 23 May 2222 0033 7 24 May 2311 2232 8 *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. Active on 20 May. Quiet to unsettled on other days. 2. FORECAST (25 MAY - 24 JUNE) Disturbed Periods: 06-Jun, 16-21 Jun. Best Quiet Periods: 30 May to 1 Jun, 11 Jun, 13-14 Jun. 3. FORECAST FOR HIGH RESOLUTION AEROMAGNETIC SURVEYS Northern Australian Regions: Disturbed Periods: None. Best Quiet Periods: 25 May to 20 Jun. Central Australian Regions: Disturbed Periods: None. Mildly Disturbed Periods: 02-Jun, 06-07 Jun, 16-Jun, 18-Jun Best Quiet Periods: 27-May to 01-Jun, 11-15 Jun. Southern Australian Regions: Disturbed Periods: 02-Jun, 06-07 Jun, 16-Jun, 18 Jun. Best Quiet Periods: 27-May to 01-Jun, 11-15 Jun. 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.