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The main object of this paper is to find necessary and sufficient conditionsfor generalized Bessel functions of first kind $zu_{p}(z)$ to be in the classes$\mathcal{SP}_{p}(\alpha ,\beta )$ and $\mathcal{UCSP}(\alpha ,\beta )$ ofuniformly spirallike functions and also give necessary and sufficientconditions for $z(2-u_{p}(z))$ to be in the above classes. Furthermore, we givenecessary and sufficient conditions for $\mathcal{I}(\kappa ,c)f$ \ to be in$\mathcal{UCSPT}(\alpha ,\beta )$ provided that the function $f$ is in theclass $\mathcal{R}^{\tau }(A,B)$. Finally, we give conditions for the integraloperator $\mathcal{G(}\kappa ,c,z\mathcal{)=}% \int_{0}^{z}(2-u_{p}(t))dt$ tobe in the class $\mathcal{UCSPT}(\alpha ,\beta ).$ Several corollaries andconsequences of the main results are also considered.

An application of generalized Bessel functions on subclasses of uniformly spirallike functions