Jovian Injections Observed at High Latitude. Issue 16 (31st August 2019)

• Record Type: Journal Article
• Authors: Haggerty, D. K.; Mauk, B. H.; Paranicas, C. P.; Clark, G.; Kollmann, P.; Rymer, A. M.; Gladstone, G. R.; Greathouse, T. K.; Bolton, S. J.; Levin, S. M.
• Is Part Of: Geophysical research letters. Volume 46:Issue 16(2019)
• Page Start: 9397
• Page End: 9404
• Publication Date: 2019-08-31
• Subjects: Jupiter -- Juno -- injections -- high latitude -- energetic particles; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1029/2019GL083442
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: The polar orbit of Juno at Jupiter provides a unique opportunity to observe high‐latitude energetic particle injections. We measure energy‐dispersed impulsive injections of protons and electrons. Ion injection signatures are just as prevalent as electron signatures, contrary to previous equatorial observations. Included are previously unreported observations of high‐energy banded structures believed to be remnants of much earlier injections, where the particles have had time to disperse around Jupiter. A model fit of the injections used to estimate timing fits the shape of the proton signatures better than it does the electron shapes, suggesting that electrons and protons are different in their abilities to escape the injection region. We present ultaviolet observations of Jupiter's aurora and discuss the relationship between auroral injection features and in situ injection events. We find, unexpectedly, that the presence of in situ particle injections does not necessarily result in auroral injection signatures. Key Points: High‐latitude observations at Jupiter reveal features of injections (L < 15 RJ ) and associated auroral signatures not previously reported Included are a near equality of electron and ion injections, puzzling differences between their signatures and signatures of old injections There is no one‐to‐one correspondence between the in situ particle and auroral signatures of injections, contrary to literature expectations