WEAK SUDDEN IMPULSE DETECTED (23nT) IN IPS MAG DATA 19 09 01 0223UT Mean Mag Parameters Pre/Post Impulse: Pre Post Pre/Post Stn Unit Impulse Impulse Change dwn nT 105.4 125.8 20.3 hbt nT 25.8 48.6 22.8 cbr nT -29.3 -2.5 26.8