Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.2405b&link_type=abstract
American Astronomical Society, DPS meeting #41, #24.05
Astronomy and Astrophysics
Astronomy
Scientific paper
The ionospheric structure of Jupiter shows a pronounced variability in terms of magnitude and location of the main electron density peak with multiple layers of enhanced electron density in the lower ionosphere. This indicates that atmospheric dynamics can successfully compete with local chemistry to modify the distribution of the main ions. Neutral winds drag ions via collisions along the direction of the local magnetic field lines. We focus on the effect of the neutral wind shear induced by the presence atmospheric gravity waves on the vertical and horizontal distribution of ions and discuss the long term impact of gravity waves on the overall ionospheric structure of Jupiter.
The dynamical effects on the ion densities are investigated using a 2D, time-dependent, diffusive, and chemical model that allows for spatially and temporally varying winds. The ion chemistry involved is simplified (accounting for H+, H2+, He+, H3+, HeH+, and CH4+) but reproduces well the structure of the dominant ions (H+ and H3+) in the region of interest. The model is used to propagate gravity waves throughout the thermospheric-ionospheric region of Jupiter in order to quantify the effects of the wave on the ionosphere. The model is also employed to identify potentially observable signatures in the resulting structure of the H3+ ion and electron densities. A breadth of ionospheric conditions and wave parameters are examined, including the presence of background winds, magnetic field orientation, wave propagation direction, long and short wave periods, a variety of wavelengths, and several altitudes of the peak wave amplitude.
Barrow Daniel
Matcheva Katia
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