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What does Ha stand for?

Ha stands for Hydrogen Alpha

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 65 other meanings of Ha in our Acronym Attic

Samples in periodicals archive:

The picture shows a wealth of detail including several nodes of Hydrogen Alpha nebulosity denoting star forming regions showing up red in the outer spiral arms.
In addition, the Department has purchased three solar filters: a Thousand Oaks Optical Type 2 Plus Filter for the 12" Meade, a Thousand Oaks Optical Hydrogen Alpha Filter for the 12" Meade, and a Thousand Oaks Optical Type 2 Plus for our Celestron 5.