WEAK SUDDEN IMPULSE DETECTED (29nT) IN IPS MAG DATA 12 10 01 0240UT Mean Mag Parameters Pre/Post Impulse: Pre Post Pre/Post Stn Unit Impulse Impulse Change dwn nT 91.0 123.2 32.2 hbt nT 43.1 68.0 24.8 cbr nT -27.9 3.1 31.0