Ha or H-alpha

Alternative definitions (0), class: vernacular (0)
Term: Ha or H-alpha

The first atomic transition in the hydrogen Balmer series; wavelength = 656.3 nm. This absorption line of neutral hydrogen falls in the red part of the visible spectrum and is convenient for solar observations. The Ha line is commonly used for patrol observations of solar flares, filaments, prominences, and the fine structure of active regions.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan