定义:若两个椭圆的离心率相等,则称两个椭圆是“相似”的\(.\) 如图,椭圆\(C_{1}\)与椭圆\(C_{2}\)是相似的两个椭圆,并且相交于上下两个顶点\(.\)椭圆\(C_{1}\):\( \dfrac {x^{2}}{a^{2}}+ \dfrac {y^{2}}{b^{2}}=1(a > b > 0)\)的长轴长是\(4\),椭圆\(C_{2}\):\( \dfrac {y^{2}}{m^{2}}+ \dfrac {x^{2}}{n^{2}}=1(m > n > 0)\)短轴长是\(1\),点\(F_{1}\),\(F_{2}\)分别是椭圆\(C_{1}\)的左焦点与右焦点,
\((\)Ⅰ\()\)求椭圆\(C_{1}\),\(C_{2}\)的方程;
\((\)Ⅱ\()\)过\(F_{1}\)的直线交椭圆\(C_{2}\)于点\(M\),\(N\),求\(\triangle F_{2}MN\)面积的最大值.