  Recent observations of solar type stars with the Kepler satellite by Maehara
et al. have revealed the existence of superflares (with energy of 10^33 - 10^35
erg) on Sun-like stars, which are similar to our Sun in their surface
temperature (5600 K - 6000 K) and slow rotation (rotational period > 10 days).
From the statistical analysis of these superflares, it was found that
superflares with energy 10^34 erg occur once in 800 years and superflares with
10^35 erg occur once in 5000 years on Sun-like stars. In this paper, we examine
whether superflares with energy of 10^33 - 10^35 erg could occur on the present
Sun through the use of simple order-of-magnitude estimates based on current
ideas relating to the mechanisms of the solar dynamo.
