Superflare
Since superflares can occur on stars apparently equivalent in every way to the Sun, it is natural to ask if they can occur on the Sun itself. An estimate based on the original Kepler photometric studies suggested a frequency on solar-type stars (early G-type and rotation period more than 10 days) of once every 800 years for an energy of 10 erg and every 5000 years at 10 erg. One-minute sampling provided statistics for less energetic flares and gave a frequency of one flare of energy 10 erg every 5–600 years for a star rotating as slowly as the Sun; this would be rated as X100 on the solar flare scale. This is based on a straightforward comparison of the number of stars studied with the number of flares observed. An extrapolation of the empirical statistics for solar flares to an energy of 10 erg suggests a frequency of one in 10,000 years.
Solar Saros 147
Solar Saros 147, repeats every 18 years, 11 and 1/3 days, and contains 80 events in which 40 will be partial eclipses and 40 will be annular. There are no total or hybrid eclipses in this series. It includes 25 central solar eclipses with a penumbral internal contact (penumbra northern and southern limits), starting in 2129 and ending in 2562. Lunar Saros 140 interleaves with this solar saros with an event occurring every 9 years 5 days alternating between each saros series.