URSIGRAM SYDNEY 21/0000UT DECEMBER 2025 GEOALERT SYD355 UGEOA 85303 51221 0000/ 4021/ 11211 21211 30211 99999 PLAIN MAGNETIC FORECAST: ACTIVE due to CORONAL HOLE BT Australian Space Weather Forecasting Centre Bureau of Meteorology ASWFC at bom.gov.au www.bom.gov.au | www.sws.bom.gov.au