Hydrogen-alpha, typically shortened to H-alpha or Hα, is a deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and...

{\displaystyle \ldots } Or, directly again from the derived definition, Hα(Hα) = α(Hα(Hα)). If α expresses a "computational step" computed by αρν for some ρ...

the observation of not very bright flares with small telescopes. For years Hα was the main, if not the only, source of information about solar flares. Other...

Scientific Achievement Medal in 1974. In 1956, Henize published the Catalogues of Hα-Emission Stars and Nebulae in the Magellanic Clouds. The paper references...

extremely difficult to observe visually. It can be observed with a Hα filter (isolates the Hα line at 656 nm) or Hβ filter (isolates the Hβ line at 486 nm)...

"Improved radial velocity orbit of the young binary brown dwarf candidate Cha Hα 8". Astronomy and Astrophysics. 521 (A24): A24. arXiv:1006.2383. Bibcode:2010A&A...

ejections accelerate shocks. Moreton waves can be observed primarily in the Hα band. Asteroseismology Gravity wave Helioseismology OSO 8 Solar prominence...

1086/301260. Stanishev, V.; Zamanov, R.; Tomov, N.; Marziani, P. (2004). "Hα variability of the recurrent nova T Coronae Borealis". Astronomy and Astrophysics...

measured to vary by about 10 km/s around a mean of 21.5 km/s. In 1933, the Hα line in Rigel's spectrum was seen to be unusually weak and shifted 0.1 nm...

L.; Madsen, G. J.; Jaehnig, K. P.; Percival, J. W. (2003), "The Wisconsin Hα Mapper Northern Sky Survey", Astrophysical Journal Supplement, 145 (2): 405...

ultraviolet, white light, and Hα are sometimes referred to as X-ray jets, EUV jets, white-light jets, and Hα jets (or Hα surges), respectively. Since ejected...

"16–20 MJup Radial Velocity Companion Orbiting the Brown Dwarf Candidate Cha Hα 8". The Astrophysical Journal. 666 (2): L113–L116. arXiv:0707.3744. Bibcode:2007ApJ...

component in the Hα line, and not in higher order Balmer lines. In Type 1.8, very weak broad lines can be detected in the Hβ lines as well as Hα, even if they...

region of star formation. The star cluster contains the emission-line star LkHα 101, which provides much of the ionizing radiation in the nebula. NGC 1579...

brightenings in the Sun's photosphere. They are only observed in the wings of the Hα, Hβ, and Hγ hydrogen spectral lines and take place in emerging flux regions...

Colour images reveal a red colour that originates from ionised hydrogen gas (Hα) predominantly behind the nebula, and caused by the nearby bright star Sigma...

ISBN 0-521-59264-X. Jiang, Y., Chen, H., Shen, Y., Yang, L., & Li, K. (2007, January). Hα dimming associated with the eruption of a coronal sigmoid in the quiet Sun...

chromosphere has a characteristic red color due to electromagnetic emissions in the Hα spectral line. Information about the chromosphere is primarily obtained by...

from quasar Hα line correlation. Another paper suggests much higher masses of (8.318±0.6)×1010 M☉ and 8.511+2.2 −1.8×1010 M☉ based on Hα and Hβ line correlations...

supernova remnants due to having similar SII/Hα line ratios although most supernova remnants have higher NII/Hα line ratios. Using angular dimensions of 7’...

continuously differentiable function at the point a ∈ Rn. Then there exist functions hα : Rn → R, where | α | = k , {\displaystyle |\alpha |=k,} such that f ( x )...

coordinate system Ha, or alternative hypothesis, in statistical testing H-alpha (Hα), a deep-red visible spectral line of the hydrogen atom Ha (Chinese surname)...

& Tirion 2001, pp. 106–108. Catanzaro, G. (2013). "Spectroscopic atlas of Hα and Hβ in a sample of northern Be stars". Astronomy & Astrophysics. 550 (A79):...

addition to regions of red and of blue-violet. The red hue is a result of the Hα recombination line radiation at a wavelength of 656.3 nm. The blue-violet...

the Sun's surface: sunspots and faculae occur in the photosphere; spicules, Hα filaments and plages in the chromosphere; prominences in the chromosphere...

is the unilateral shift on a Hilbert space Hα, and U is a unitary operator (possible vacuous). The family {Hα} consists of isomorphic Hilbert spaces. A...

Hugh R. A.; Barnes, John R. (June 2017). "Calculations of periodicity from Hα profiles of Proxima Centauri". Astronomy & Astrophysics. 602. A48. arXiv:1608...

0.1 cm−1 resolution. Michelson himself attempted to resolve the hydrogen Hα emission band in the spectrum of a hydrogen atom into its two components by...

J.; Su, K. Y. L.; Young, E. T. (2004). "Spatially Resolved Ultraviolet, Hα, Infrared, and Radio Star Formation in M81". Astrophysical Journal Supplement...

Wright, N.; Zijlstra, A. A.; Zurita, A. (September 2005). "The INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS)". Monthly Notices of the Royal...