Once you have a figure you're reasonably confident about, you can plug that number, as well as such information as your age, your retirement account balances, the amount you'll receive from Social Security, pension income, if any, and how long you expect to live in retirement (I'd say into your mid-90s is
a decent estimate given today's longer lifespans) into a tool like T. Rowe Price's Retirement Income Calculator.
Last but not least, a
decent solar maximum could finally spur NASA to replace its Advanced Composition Explorer probe, which floats between the Earth and the sun and
gives us our best
estimate of the power of an incoming storm.