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The quasistatic limit of the velocity-gauge strong-field approximationdescribing the ionization rate of atomic or molecular systems exposed to linearpolarized laser fields is derived. It is shown that in the low-frequency limitthe ionization rate is proportional to the laser frequency, if a Coulombiclong-range interaction is present. An expression for the correspondingproportionality coefficient is given. Since neither the saddle-pointapproximation nor the one of a small kinetic momentum is used in thederivation, the obtained expression represents the exact asymptotic limit. Thisresult is used to propose a Coulomb correction factor. Finally, theapplicability of the found asymptotic expression for non-vanishing laserfrequencies is investigated.

Quasistatic limit of the strong-field approximation describing atoms and molecules in intense laser fields