Yet Another Power Tower

Calculus Level 4

aaa=13\huge a^{a^{a^{\cdot^{\cdot^\cdot}}}}=\frac{1}{3}

How many positive real solutions aa does the above equation have?

Hint: Argue "from first principles", without using any properties of the infinite power tower you might know.

Clarification: The value of the infinite power tower aaa...a^{a^{a^{.^{.^.}}}} is defined as the limit of the sequence x1=a,xn+1=axn,x_1=a, x_{n+1}=a^{x_n}, if that limit exists.

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