Distribution of hydrogen and helium in the upper atmosphere

dc.contributor.author	Kockarts, G.
dc.date	1972
dc.date.accessioned	2017-08-25T11:36:48Z
dc.date.available	2017-08-25T11:36:48Z
dc.identifier.uri	https://orfeo.belnet.be/handle/internal/6005
dc.description	A general review of the principal parameters influencing the helium and hydrogen distributions is presented for several physical conditions which are responsible for the upper atmospheric structure. The main differences between the helium and the hydrogen problems are pointed out. In particular, the effect of vertical transport is not similar for the two components. Helium is mainly dominated by the eddy diffusion coefficient whereas, in the case of hydrogen, the vertical flow is the lead ng factor. It is also shown how eddy diffusion can play a role in the structure of the helium bulge which is now very well confirmed by satellite observations.
dc.language	eng
dc.title	Distribution of hydrogen and helium in the upper atmosphere
dc.type	Article
dc.subject.frascati	Earth and related Environmental sciences
dc.audience	Scientific
dc.source.title	Journal of Atmospheric and Terrestrial Physics
dc.source.volume	34
dc.source.issue	10
dc.source.page	1729-1743
Orfeo.peerreviewed	Yes
dc.identifier.doi	10.1016/0021-9169(72)90032-3
dc.identifier.scopus	2-s2.0-0005836940