| タイトル | The solar Ly-alpha line profile |
| 著者（英） | Rottman, Gary J.; Fontenla, Juan; Woods, Thomas N.; Avrett, E. H.; White, O. R. |
| 著者所属（英） | NASA Marshall Space Flight Center; NASA Headquarters |
| 発行日 | 1995-04-01 |
| 言語 | eng |
| 内容記述 | Solar Ly-alpha irradiance measurements from the SOLar STellar Irradiance Comparison Experiment (SOLSTICE) on the Upper Atmosphere Research Satellite (UARS) have been made since 1991 October with a spectral resolution of 0.1 nm. The uniqueness of the small molecular oxygen cross section near Ly-alpha permits the Ly-alpha radiation to penetrate much deeper into the atmosphere than the other emissions near Ly-alpha. We have taken advantage of this phenomenon by performing solar occultation experiments near the Ly-alpha to evaluate precisely the instrument scattered light contribution. After correcting for scattered light, the broad wings of the solar Ly-alpha line can be extracted out to 5 nm from line center with a typical accuracy of +/-20%. The variability in the Ly-alpha wings near 2 nm from line center is about one-half that of the Ly-alpha core emission, defined within 0.1 nm from line center. These Ly-alpha profile measurements are found to be consistent with the Skylab radiance measurements and theoretical models of the Ly-alpha line profiles computed using partial redistribution of photons in the source function. |
| NASA分類 | SOLAR PHYSICS |
| レポートNO | 95A78065 |
| 権利 | Copyright |
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