Observations of MCs associated with (a) Event 1 and (b) Event 2 measured by the ACE spacecraft. From top to bottom, the panels: magnetic field intensity B; the three magnetic field components B_x, B_y, and B_z in GSE coordinates; plasma velocity V_sw; proton density N_p; temperature T_p; and plasma-β. The dashed curves plotted over T_p represent T_ex. The vertical black lines indicate the start and end times of the MCs. Time is given (in hours) on the x-axes; the times in UT corresponding to the zero-hour times are indicated below the axes.