Without masking the shot & treating both halves differently, the best I can come up with quickly is the following:-
Original for comparison [jpg of RAW preview]
To add punch & try clean up what is a pretty noisy image..
[All settings are at 'overkill' to clearly show the principle without having to look at the full size images.]
Lift exposure slightly, brighten the shadows whilst dropping the blacks, add a little clarity.
Tweak the curves to push 'mid-dark' yet push back 'very dark' - in essence, more of the same as the last step, just honed more tightly
& the biggie - try to clean up the luminance noise.
TBH, this is only partially successful. Short of splitting & masking each half [sky/ground] separately, I'd be tempted to just use the Spot Heal tool on the areas where the noise smoothing fails.
I tried doing this in Nikon Capture but couldn't get anywhere near.
Photoshop Camera RAW processing sheets...
Result... [jpg again]
The horizon does look a bit HDR, but my excuse is this was a 'quick fix'.
Ignore the banding too, that's a result of the overkill settings ;)