URSIGRAM SYDNEY 17/0000UT DECEMBER 2025 GEOALERT SYD351 UGEOA 85303 51217 0000/ 4021/ 11171 21171 30171 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