An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1 Search : h-alpha
H-alpha
   H-آلفا   
H-âlfâ (#)

Fr.: H-alpha (Hα)   

The → Balmer series spectral line of hydrogen which results from → atomic transition between the → energy levels 2 and 3. It has a wavelength of 656.4 nm and falls in the red region of the visible spectrum.

H, symbol of → hydrogen; alpha (α), the first letter of Gk. alphabet.