URSIGRAM SYDNEY 05/0000UT DECEMBER 2025 GEOALERT SYD339 UGEOA 85303 51205 0000/ 4021/ 12051 21051 30051 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