New evidence for the role of photoelectrons in the H2-dayglow of the giant planets

Details New evidence for the role of photoelectrons in the H2-dayglow of the giant planets New evidence for the role of photoelectrons in the H2-dayglow of the giant planets

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161l...1p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

10

Dayglow, Extreme Ultraviolet Radiation, Jupiter Atmosphere, Photoelectrons, Planetary Radiation, Saturn Atmosphere, H Lines, Planetary Ionospheres, Rydberg Series, Solar Flux Density, Solar Planetary Interactions, Stimulated Emission, Ultraviolet Spectra, Voyager Project

Scientific paper

The main characteristics of the dayside planetwide H2 Rydberg emissions in the EUV range observed by the Voyager EUV experiment are discussed, and, through comparison with previous terrestrial observations of photoelectrons, arguments are presented showing the close morphological relationship between these emissions on Jupiter and Saturn, and photoelectrons. An energy budget discrepancy is, however, found, and a mechanism is suggested in which part of the photoelectron population, the high energy tail, can be fully responsible for the H2 emissions through excitation of Rydberg levels, while the low energy tail could be responsible for stimulated emission of metastable level otherwise excited without the deposition of energy. This model indicates that the photoionized population, mainly the photoelectrons, could be directly responsible for the EUV emissions and ionospheric H(+) losses.

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