The hydrogen emission spectrum in three white-light flares

Physics

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24

Balmer Series, Paschen Series, Solar Flares, Solar Spectra, Infrared Spectra, Ultraviolet Spectra

Scientific paper

It has been found that the radiative losses in the continuum of the solar white-light flares (WLFs) are quite substantial. The identification of the involved emission mechanism becomes, therefore, important to the problem of specifying the height in the atmosphere at which the flare energy is deposited. A description is presented of the measurements of the spectra of three WLFs, giving particular attention to the region near the Balmer line series. The three WLFs occurred on April 24, 1981, June 4, 1982, and June 6, 1982. The emission in the flare of April 24, 1981, was sufficiently strong to permit a conclusive search for the Paschen jump. Evidence for this jump was found on three spectrograms near flare maximum. The existence of the Paschen jump casts serious doubt on an earlier conclusion that the optical and infrared continuum was dominated by H(-) emission.

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