WEAK SUDDEN IMPULSE DETECTED (18nT) IN IPS MAG DATA 30 09 01 1924UT Mean Mag Parameters Pre/Post Impulse: Pre Post Pre/Post Stn Unit Impulse Impulse Change dwn nT 14.6 35.9 21.3 hbt nT 36.8 51.9 15.0 cbr nT -17.9 0.6 18.5