  Since the discovery of solar cycle related with magnetic field in 1908, deep
seated oscillatory dynamo has been studied extensively. However, there are
still open questions on the solar dynamo, e.g., asymmetric conversion between
large-scale poloidal and toroidal field as well as physics underlying the
butterfly pattern of sunspots. Here we report a new generation of large-scale
magnetic field and process of energy release. The inductive action of fluid
motions pervading the solar interior is represented by a RLC circuit in which
the toroidal field built up through twisting of poloidal field, so called
$\omega$-effect, plays the role of a capacitor.
  Such a RLC circuit not only provides a self-sustained oscillatory system
avoiding Cowling's antidynamo theorem, but also site of rapid magnetic
reconnection which reproduces quadrupole magnetic field interpreting the
behavior of sunspots and moving of foot-point in solar activities. Moreover,
parameters of the circuit and the Sun are well consistent with the 22-year
solar cycle.
