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JAMMIES: (A New) Jovian Atmospheric Model Making Ionospheric EStimates

Presentation #324.01 in the session Giant Planet Magnetospheres, Ionospheres and Aurorae (Poster + Lightning Talk)

Published onOct 23, 2023
JAMMIES: (A New) Jovian Atmospheric Model Making Ionospheric EStimates

We present preliminary results from the first comprehensive simulation of non-auroral electrodynamics in the Jovian ionosphere: JAMMIES. We adapt the Earth ionospheric simulation code SAMI2 (Sami2 is Another Model of the Ionosphere), modifying the atmospheric chemistry and planetary parameters to match that of Jupiter. SAMI2 — using a magnetic field aligned grid — has been notably successful at reproducing electrodynamic features in Earth’s ionosphere. This framework allows us to examine non-auroral electrodynamics using fluid equations in a dipole coordinate system at Jupiter. This work consists of a novel dipolar-approximation of the JRM33 internally-generated Jovian magnetic field, constructing a model grid used to simulate ion and electron densities (and velocities) as a function of latitude, altitude, and local time. This work is motivated by four questions regarding the low-latitude Jovian upper atmosphere:

(a) What drives and generates the H Ly- Bulge (an enhancement of the superthermal neutral H population located at fixed magnetic longitudes)?

(b) What causes the H3+ Dark Ribbon (a diminution of H3+ ionospheric emission along the magnetic equator)?

(c) Is there an Equatorial Ionization Anomaly (EIA, a process at Earth which bifurcates plasma in the ionosphere to either side of the subsolar point) present at Jupiter’s magnetic equator?

(d) Could the EIA process explain the questions (a) and (b)?

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