[ips-si-alert] WEAK SUDDEN IMPULSE DETECTED (9nT) IN MAGNETOMETER DATA 21 07 26 1102UT issued 1119 UT on 21 Jul 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

WEAK SUDDEN IMPULSE DETECTED (9nT) IN MAGNETOMETER DATA 21 07 26 1102UT
               Mean Magnetometer Parameters Pre/Post Impulse:
                                     Pre        Post       Pre/Post
Magnetometer Station          Unit   Impulse    Impulse    Change
Cocos_Island_(GA/BOM/ETH)      nT    257.1      261.8        4.7
Darwin_(GA)                    nT    132.2      140.6        8.4
Darwin                         nT     48.1       57.1        9.0
Townsville_(GA)                nT   -658.8     -648.0       10.8
Townsville                     nT   -843.2     -832.7       10.5
Townsville_(ICSWSE/BOM)        nT    -78.0      -67.6       10.5
Learmonth_(GA)                 nT    324.7      334.0        9.2
Learmonth_(SWS)                nT   -975.9     -966.8        9.1
Canberra_(GA)                  nT   -200.2     -189.0       11.2
Hobart                         nT   -380.2     -369.9       10.2

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