Synthetic test has x and y swapped

[kujaku11]

I'm not sure where this comes from, it looks like it might be in building the H5's but it looks like either Ex and Ey are swapped or Hx and Hy are swapped. When plotting the synthetic result with MTpy I get this:

Aurora Results

And the phases look like:

EMTF Results

Looks like EMTF results also has a phase flip. Could be mtpy-v2 or just a channel nomenclature issue.

[kkappler]

Yep, something does not look correct here.

Quick sanity check:

We expect (theoretically) for a homogeneous earth: phase_xy to be +45 degrees phase_yx to be -135 degrees

If that is correct, then we can fix the phase issue by

• flipping the polarities of the electric channels only, or
• flipping the polarities of the magnetic channels only

Not sure whether to fix this in the data, or in the reader.

[kkappler]

This has been fixed in the reader, with a non-robust fix.

A better fix would probably be to migrate the synthetic data to csv with headers, and make the reader assign the nomenclature after reading with the standard channel names, per mth5 issue 236