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A new source of auroral infrared emission observed by TIMED/SABER

We demonstrate for the first time that O2+ + NO charge transfer produces NO+(v). This mechanism identifies a new source of auroral infrared emission at 4.3 μm, which provides a major step forward in understanding auroral processes and a new context for understanding previously observed auroral enhancements in O2(b1Σg+) and O2(a1Δg) bands. The charge transfer process is identified by comparing physics‐based model simulations with NO+(v) volume emission rates derived from SABER 4.3 μm limb emission measurements.