The Ultraviolet Spectrum of the Sun from V-2 Rockets

Abstract

Spectra of the sun have been obtained from V-2 rockets at heights up to 155 km. A grating spectrograph was used giving a dispersion of 34A/mm. The ultraviolet spectrum of the sun obtained extends down to $\lambda =2300\mathrm{}$A, and traces are evident as far as $\lambda =2230\mathrm{}$A. A tentative list of identified lines is given. The MgII resonance doublet at $\lambda =2800\mathrm{}$A is observed to have emission centers in both absorption components. The intensity of this emission is estimated as about 10 percent that of the adjacent continuum.