The Spectrum of the 1/4 keV Band Diffuse Soft X-ray Background

The spectrum of the 145-284 eV (42-85 Angstrom) band of a portion of the diffuse x-ray sky was obtained in 1993 by the Diffuse X-ray Spectrometer. We compare these data to a model including a computation of the spectra of a few ions due to solar wind charge exchange in the heliosphere, obtaining solar wind parameter ranges by studying the in situ observations at a similar phase in the following solar cycle, i.e. in 2003. The one spectral feature which is consistent with an unblended, isolated line is coincident with the hydrogenic oxygen Balmer Delta *g (n=5 to 2) transition, which should be strongly pumped by charge exchange.