let's suppose we have a function field $F$ and some Drinfeld modular variety of rank $r$ over $F$, with some level structure $Y^{(r)}(N)$. Then the field of constants of $Y^{(r)}(N)$ is some class field $F_N$ of $F$ depending on $r$ (coming from the determinant subgroup of the idele class group), and I'm looking for a reference for the class field theory-type desciption of the action of $\mathrm{Gal}(F_N/F)$ on $Y^{(r)}(N)$: I'm pretty sure that the image of an ideal $\mathfrak{a}$ under Artin reciprocity just sends the moduli of a Drinfeld module $E$ to that of $E/E[\mathfrak{a}]$, but I would really love to have this written down somewhere. Thank you!
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