  We have shown that the Sun's shadow by high energy cosmic rays moves year by
year and its behavior is correlated with a time variation of the large-scale
structure of the solar and interplanetary magnetic fields. The solar activity
was near minimum in the period from 1996 through 1997. Using the data obtained
with the Tibet air shower array, we examined the shadowing of cosmic rays by
the Sun in this quiet phase of solar cycle, and found that the Sun's shadow was
just in the apparent direction of the Sun, though it was observed at the
position considerably away from the Sun to the south-west in the period between
1990 and 1993. It is known that the magnetic pole of equivalent solar dipole
was reversed during the previous active phase, and near solar minimum the
dipole was aligned with the rotating axis, preserving its N-pole on the north
pole side of the Sun. This causes the solar magnetic field to shift the Sun's
shadow to the east. Thus, the observed results suggest that the shift of the
Sun's shadow due to the solar magnetic field was pushed back by the effect of
the geomagnetic field, since the geomagnetic field always make the shadow shift
to the west. We discuss the Sun's shadow observed during the period near solar
minimum in 1996-1997 and compare it with the simulation results.
