Term for direct/beam horizontal irradiance

[AdamRJensen]

It would be beneficial to also include a term for direct/beam horizontal irradiance as this is also frequently used. E.g., reanalysis data often only include direct/beam horizontal irradiance and not the normal component.

The solar resource community has not decided on a standard abbreviation, as the most straightforward naming, "Direct Horizontal Irradiance", would clash with the already existing term Diffuse Horizontal Irradiance (DHI). For this reason, some use the term Beam Normal Irradiance (BNI) instead of DNI and then Beam Horizontal Irradiance (BHI).

pv-terms could consider adopting the BHI acronym or perhaps an even better alternative?