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Jovian Injections Observed at High Latitude
D K Haggerty1, B H Mauk1, C P Paranicas1
1The Johns Hopkins University Applied Physics Laboratory Laurel MD USA.
Geophysical Research Letters
|November 26, 2019
Summary
Juno
Area of Science:
- Planetary Science
- Plasma Physics
- Space Physics
Background:
- Jupiter's magnetosphere experiences energetic particle injections.
- Previous studies focused on equatorial observations of these injections.
Purpose of the Study:
- To investigate high-latitude energetic particle injections at Jupiter using Juno's polar orbit.
- To compare proton and electron injection signatures and their relationship with auroral emissions.
Main Methods:
- Analysis of energy-dispersed impulsive injections of protons and electrons.
- Modeling injection timing and particle escape characteristics.
- Correlation of in situ observations with ultraviolet aurora data.
Main Results:
- Ion injection signatures are as prevalent as electron signatures at high latitudes.
- Observed high-energy banded structures suggest dispersed remnants of earlier injections.
- Proton signatures fit the injection model better than electron signatures, indicating different escape behaviors.
- In situ particle injections do not always correlate with auroral injection signatures.
Conclusions:
- Jupiter's high-latitude injections exhibit distinct characteristics compared to equatorial observations.
- Protons and electrons display different escape dynamics from the injection region.
- The link between in situ particle injections and auroral emissions is more complex than previously thought.
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