Observations of Lyman-α emissions of hydrogen and deuterium

dc.contributor.author	Bertaux, J.L.
dc.contributor.author	Goutail, F.
dc.contributor.author	Kockarts, G.
dc.date	1984
dc.date.accessioned	2017-06-28T09:36:37Z
dc.date.available	2017-06-28T09:36:37Z
dc.identifier.uri	https://orfeo.belnet.be/handle/internal/5897
dc.description	A spectrophotometer was flown on Spacelab 1 to study various mechanisms of Lyman-α emission in the upper atmosphere. The use of absorption cells filled with H2 and D2 gases allowed us to discriminate a number of weak Lyman-α emissions heretofore masked by the strong H geocoronal emission due to resonance scattering of solar photons. Preliminary results are presented on three topics: the first optical detection of the deuterium Lyman-α emission at 110 kilometers, with an intensity of 330 rayleighs indicating an eddy diffusion coefficient of 1.3 × 106 square centimeters per second; auroral proton precipitations seen on both the night and the day side; and an emission located above 250 kilometers of altitude, interpreted as the result of charge exchange of magnetospheric protons with geocoronal atoms.
dc.language	eng
dc.title	Observations of Lyman-α emissions of hydrogen and deuterium
dc.type	Article
dc.subject.frascati	Physical sciences
dc.audience	Scientific
dc.source.title	Science
dc.source.volume	225
dc.source.issue	4658
dc.source.page	174-176
Orfeo.peerreviewed	Yes
dc.identifier.doi	10.1126/science.225.4658.174
dc.identifier.scopus	2-s2.0-0021576437