[ips-si-alert] WEAK SUDDEN IMPULSE DETECTED (24nT) IN MAGNETOMETER DATA 11 12 25 1500UT issued 1519 UT on 11 Dec 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

WEAK SUDDEN IMPULSE DETECTED (24nT) IN MAGNETOMETER DATA 11 12 25 1500UT
               Mean Magnetometer Parameters Pre/Post Impulse:
                                     Pre        Post       Pre/Post
Magnetometer Station          Unit   Impulse    Impulse    Change
Cocos_Island_(GA/BOM/ETH)      nT    236.8      255.1       18.3
Darwin_(GA)                    nT    140.6      161.0       20.4
Darwin                         nT     35.7       58.7       23.0
Townsville_(GA)                nT   -635.4     -610.2       25.3
Townsville                     nT   -726.7     -702.1       24.6
Townsville_(ICSWSE/BOM)        nT     12.2       36.7       24.6
Learmonth_(GA)                 nT    315.1      347.3       32.1
Learmonth_(SWS)                nT   -960.9     -928.9       32.1
Alice_Springs_(GA)             nT     65.3       91.5       26.2
Canberra_(GA)                  nT   -171.7     -145.1       26.6
Hobart                         nT   -444.1     -425.5       18.6
Hobart_(ICSWSE/BOM)            nT    -21.7       -3.3       18.3

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au