NDLI: Variability of lyman-alpha emission from jupiter

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Variability of lyman-alpha emission from jupiter

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1979
Description	The Jovian Lyman-alpha emission line was again observed in 1978 using the high resolution spectrometer on the Copernicus satellite. In intensity of 8.4+3.0 kilo Rayleighs was measured. This value represents a significant increase in intensity over previous (1976) Copernicus observations, but is lower than the recent (1979) values obtained by Voyager I and IUE. The increase in intensity was accompanied by a significant increase in line width, giving strong support to the theory that the emission results from resonant scattering of the solar Ly-alpha line by H atoms in the upper Jovian atmosphere. The strength of Jovian Ly-alpha emission correlates well with the level of solar activity. The solar extreme ultraviolet radiation varies with the solar cycle. This radiation causes the dissociation of H2 and CH4 into H atoms in the Jovian atmosphere. Therefore, in times of high solar activity, the H column density will increase, causing the observed stronger Jovian Ly-alpha emission.
File Size	4120480
Page Count	21
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19790018874
Archival Resource Key	ark:/13960/t3615tz82
Language	English
Publisher Date	1979-01-01
Access Restriction	Open
Subject Keyword	Astronomy Planetary Radiation Solar Activity Ultraviolet Radiation Lyman Alpha Radiation Emission Spectra Jupiter Atmosphere Hydrogen Atoms Dissociation Jupiter Planet Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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