“…JIRAM L‐band imager, whose observations will be the backbone throughout the present work, covers the 3.3–3.6 μm range, where the emission from
ions can be detected with a good contrast against the sunlit planetary disc. These ions are a byproduct of the electron precipitation (Miller et al.,
2020; Wu et al.,
2019):
where the
retains 1.74 eV of internal energy that is subsequently radiated as IR emission (Oka,
1980). The emission is expected to occur above 500 km from the 1‐bar pressure level, as at lower altitude the
is rapidly destroyed by its reaction with methane (Gérard et al.,
2018; Grodent et al.,
2001).…”