Linked from

The 17 pages that link to Hydrogen-alpha, each with the reason it gives.

• Spectral lineBroader topic: This prominent line traces ionized hydrogen in stars, nebulae, and the Sun.

• H II regionRelated: Its bright emission makes many H II regions visible in optical images.

• Fine structureBroader topic: Its spectral components reflect fine-structure differences among the participating levels.

• 21-centimeter lineCompared with: Unlike H-alpha, the 21-centimeter line traces neutral rather than ionized hydrogen.

• Emission nebulaBroader topic: H-alpha gives many hydrogen-rich emission nebulae their distinctive red appearance.

• Solar prominenceRelated: H-alpha observations make many prominences visible against the solar disk.

• Balmer seriesBroader topic: It is the longest-wavelength and usually most familiar Balmer line.

• Hydrogen spectral seriesBroader topic: This bright red line is widely used to map ionized hydrogen in space.

• Hydrogen spectrumBroader topic: This conspicuous line is widely used to map solar and nebular hydrogen.

• Star formation rateRelated: H-alpha luminosity is a widely used tracer of recent massive-star formation.

• Horsehead NebulaRelated: Hydrogen-alpha emission makes IC 434 glow behind the dark cloud.

• ChromosphereRelated: Hydrogen-alpha emission gives the chromosphere its characteristic red appearance.

• Lagoon NebulaRelated: Hydrogen-alpha emission gives the Lagoon Nebula much of its red color in photographs.

• Kennicutt–Schmidt lawRelated: H-alpha emission estimates recent star formation in many nearby galaxies.

• Solar telescopeRelated: Filters centered on this line reveal prominences and chromospheric structures.

• Omega NebulaRelated: This prominent emission line traces ionized hydrogen in nebulae such as Messier 17.

• Starburst regionRelated: Its luminosity estimates recent massive-star formation where dust allows it to escape.