Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49...63l&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Astronomy and Astrophysics
Astronomy
24
Astronomical Spectroscopy, Background Radiation, Extreme Ultraviolet Radiation, Interstellar Gas, Ultraviolet Astronomy, Diffuse Radiation, Emission Spectra, Line Spectra, Spacecraft Instruments
Scientific paper
Observations in the FUV and soft X-ray bands suggest that the ISM contains several components of high-temperature gas (100,000-1 million K). If large volumes of local interstellar space are filled with this hot plasma, emission lines will be produced in the EUV. Diffuse EUV radiation, however, has only been detected with photometric instruments; no spectral measurements exist below 520 A. A unique grazing-incidence spectrometer to study the diffuse emission between 80 and 650 A with resolution 10-30 A was successfully flown on a sounding rocket in April 1986, and a preliminary analysis reveals several features. In addition to the expected interplanetary He I 584 A emission and the geocoronal He II 304 A emission, other features appear which may orginate in the hot ionized interstellar gas.
Bowyer Stuart
Labov Simon
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