What does Ha stand for?

Hydrogen Alpha

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

Science, medicine, engineering, etc.

Other Resources:

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Hull Array Human Anatomy (college course) Humanitarian Assistance Humanitarian Assistance (DoD) Humic Acid Hyaluronic Acid Hybrid Algorithm Hybrid Amplifier Hydraulic Association (UK) Hydrocephalus Association		Hydroxyapatite Hyper-Androgenism Hypnotherapy Association La Habana (postcode, Cuba) Helicopter Attack Squadron Light (US Navy aviation unit designation used 1967-72 and again 1976-88) Heterophile Antibody Positive (mononucleosis term) High Availability Automated Control System Library Server High Availability-Base Station Manager Hospital-Acquired Methicillin-Resistant Staphylococcus Aureus Hippuric Acid in Urine

Samples in periodicals archive:

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.

Physics and Mathematics

The modification increases the transmission of light at the specific wavelength of 656nm, known as the Hydrogen Alpha line, or H(alpha) wavelength, by a factor of 2.

The Sky's the Limit with the New Canon EOS 20Da Digital SLR; Newest ...

In addition to holding over a dozen patents, Markle developed the solid Fabry Perot filters used in the hydrogen alpha telescopes utilized by the Skylab project, as well as the Fraunhofer Line Discriminator used for remote detection of weakly fluorescent materials.

Ultratech's David A. Markle receives David Richardson medal; Optical ...