Disturbances in total magnetic field magnitude ΔB are generally positive from 2200 to 1000 MLT and negative from 1000 to 2200 MLT. The maximum disturbances from the positive and negative regions of ΔB (Bp and Bn, respectively) are investigated with respect to their correlation with (1) the average north-south component Bz, (2) the average angle ϑ with respect to the solar magnetospheric equatorial plane, (3) the variance &sgr;i, and (4) the magnitude Bi of the interplanetary magnetic field. These quantities were averaged over a period T ranging from 20 min to 8 hours prior to the measurement of Bp or Bn. In the correlation with Bz two methods were used: (1) direct correlation with Bz and (2) correlation with the sum B&Sgr;=&Sgr;Bz/T, where Bz0, Bp is relatively constant. Significant magnitudes of ΔB are found to occur in both the positive and negative regions even when the interplanetary field has been northward for over an hour. Comparison of the occurrence of disturbance in ΔB with the occurrence of DP 2 fluctuations indicates no correlation between the two phenomena.