The best wavelength to use to observe a solar prominence or flare is

Question

Quizplus · Accepted Answer

Solar prominences and flares primarily emit in the hydrogen alpha spectral line at 656 nm. This specific wavelength allows for the observation of the chromosphere, which is where most solar phenomena occur. Other wavelengths, such as ultraviolet or microwave, may be useful for studying other aspects of the sun, but for prominences and flares, the hydrogen alpha line is the best choice.

The Best Wavelength to Use to Observe a Solar Prominence