Figure 3. First principal
component of IMF
B and solar wind velocity. The component is derived
from the data for intervals beginning from 4 days prior to the
commencement of a sequence of 4 consecutive days with
Ap 4
up
to 4 days after the
termination of the sequence of quiet intervals. The bottom panels
give the coefficients (as percentage) for each row of the data
matrix which provides an idea about the magnitude of the contribution
of the first component in each case.