Engineering topics

Eun, J. W.

Publications and source records attributed to Eun, J. W..

2 records

NASA NTRS1987

The natural background at Shuttle altitudes

In order to make astronomical observations from the Shuttle, the observer needs good information on the intensities and spectral characteristics of various sources. This paper presents a model spectrum for the natural airglow background. The spectrum is modeled over a wavelength range extending from the extreme ultraviolet to the near-infrared. This model is based on the present knowledge of the upper atmosphere. The effect of different viewing configurations is illustrated, together with day-to-night variations. The results synthesized here assume an ideal vehicle in the sense that no contaminant emissions are induced by the Shuttle and payload. These spectra therefore represent a baseline which can be used to locate unanticipated or nonambient features.

Torr, Marsha R.↗

NASA NTRS1985

A spectral search for Lyman-Birge-Hopfield band nightglow from Spacelab 1

Huffman et al. (1980) have reported the observation of significant intensities of the N2 Lyman-Birge-Hopfield (LBH) bands at midlatitudes at night. During the course of the 10-day Spacelab 1 mission, spectral observations were made of the atmosphere on both the dayside and nightside of the earth with the vehicle in various attitudes. The present investigation is concerned with an examination of selected data for evidence of the LBH nightglow. The considered data include far ultraviolet observations which were made on the nocturnal atmosphere at low latitudes and midlatitudes. The investigation confirms that the earlier reported LBH nightglow does appear to be generally present at the time of the Spacelab 1 mission.

Torr, M. R.↗