How can I access Data which includes the Schumann Resonances (a noise source)?
Here you can find a list of bulk data releases
The LVK records thousands of channels and many are related to environmental noise.
Since I don’t know much about Schumann Resonances, I wouldn’t know which specific channels you may be interested in, but going through the list above you may want to start with the Auxiliary Data Release, which is 3 hours around event GW170814.
I would suggest to check out what channels are there and then try the rest.
If you have a more specific channel in mind let us know.