Daily Report
Geomagnetic Summary
(last updated 12 May 2021 23:30 UT)
Geomagnetic field for Australian Region 12 May: Quiet to Major Storm Estimated Indices 12 May : A K Australian Region 25 01446523 Cocos Island 18 02435423 Darwin 20 11445512 Townsville 25 02446513 Learmonth 35 11556623 Alice Springs 25 02446522 Gingin 27 11435634 Canberra 22 01436512 Hobart 22 01436512 Estimated Antarctic Regional K Indices 12 May : Macquarie Island 41 00347711 Casey 18 12544323 Mawson 31 41544436 Observed Regional daily pc3 Indices 12 May : Darwin 0 (Quiet) Townsville 0 (Quiet) Learmonth 0 (Quiet) Alice Springs 0 (Quiet) Gingin 21 (Quiet to unsettled) Canberra 9 (Quiet) Melbourne NA 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. 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. Estimated AFr/Ap Indices 12 May : A Fredericksburg 25 Planetary 53 Observed AFr/Ap Indices 11 May : A K Fredericksburg 4 Planetary 4 2100 1111
Geomagnetic Forecast
(last updated 12 May 2021 23:30 UT)
Date Ap Conditions 13 May 15 Unsettled to Active 14 May 7 Quiet 15 May 5 Quiet COMMENT: SWS Geomagnetic Warning 17 was issued on 12 May and is current for 12-13 May. Geomagnetic conditions in the Australian region on UT day 12 May were quiet initially but then suddenly became disturbed, rising from unsettled to active levels with minor storms and a major storm period at about 14 UT. In the Antarctic region quiet to active levels were also observed with storm periods. This disturbance was most likely caused by the 9 May CME from a DSF. Global geomagnetic conditions are expected to be mostly unsettled to active on UT day 13 May, as CME effects fade. Then mostly quiet levels are expected on UT days 14-15 May.
