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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 235 records · Page 13
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NASA NTRS1975

Constant energy partitioning in the photoionization of NO and O2

Published data on the photoelectron spectra of NO and O2 are analyzed, and the energy distributions are found to have averages proportional to the available energy. Hence, vibration takes a constant fraction of the energy. Average distributions are found as a function of the fraction of available energy.

Lawrence, G. M.↗
NASA NTRS1984

Photoionization Structure of the Orion Nebula

The O III lines at 52 and 88 micro m and the N III line at 57 micro m were observed at 6 positions in the Orion Nebulae to probe the ionization structure of the nebula. The six positions form a line or cut south from and including the Trapezium. Electron densities and abundance ratios of N(++) were calculated and compared together with radio and optical observations. The predictions that the effects of heavy capacity in the ionized gas can cause the N(++) zone to extend appreciably beyond the O(++) zone are confirmed.

Simpson, J. P.↗
NASA NTRS1985

Polar cap photoionization and the ten-hour clock at Jupiter

It is shown that the clock-like modulation of the spectral index of energetic electrons (greater than 2 MeV) in the outer Jovian magnetosphere is due to a periodic shift of the particle energy spectrum toward higher and lower energies. This shift results in a modulation of the spectral index when the spectrum is not a pure power law in energy. It is suggested that the periodic energization is due to a periodic modulation of the magnetic field in the outer magnetosphere. This modulation is caused by a variation of the longitudinally averaged Pedersen conductivity due to the asymmetric solar illumination of the trace of the magnetodisk in the high-latitude ionospheres. Such a modulation requires the presence of a surface magnetic anomaly.

Goertz, C. K.↗