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Probing Jovian Broadband Kilometric Radio Sources Tied to the Ultraviolet Main Auroral Oval With Juno

Masafumi Imai, Thomas K Greathouse, William S Kurth, G Randall Gladstone, Corentin K Louis, Philippe Zarka, Scott J Bolton, John E P Connerney
Geophysical Research Letters 2019 January 28, 46 (2): 571-579
Observations of Jovian broadband kilometric (bKOM) radiation and ultraviolet (UV) auroras were acquired with the Waves and Juno-UVS instruments for ∼2 hr over the northern and southern polar regions during Juno's perijoves 4, 5, and 6 passes (PJ4, PJ5, and PJ6). During all six time periods, Juno traversed auroral magnetic field lines connecting to the UV main auroral ovals, matching the estimates of bKOM radio source footprints. The localized bKOM radio sources for the PJ4 north pass map to magnetic field lines having distances of 10 to 12 Jovian radii (R J ) at the magnetic equator, whereas the extended bKOM radio sources for the other events map to field lines extending to 20-61 R J . We found the peak bKOM intensities during Juno's potential radio source crossings show positive, negative, and no correlations with the UV main oval brightness and color ratio. Only the positive correlations suggest wave-particle energy transport.


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