在平面直角坐标系$xOy$中，曲线$C_1$和$C_2$的参数方程分别为$\left\{\begin{array}{l}x=\sqrt{5}\cos \theta \\ y=\sqrt{5}\sin \theta \end{array}\right.\left(\theta \mathrm{为参数},0\le \theta \le \frac{\mathrm{\pi }}{2}\right)$和$\left\{\begin{array}{l}x=1-\frac{\sqrt{2}}{2}t\\ y=-\frac{\sqrt{2}}{2}t\end{array}\right.\left(t\mathrm{为参数}\right)$，则曲线$C_1$与$C_2$的交点坐标为.