Synoptic decametric (DAM) radio observations at Jupiter were made in a broad Jovicentric latitudinal range of −21° to +15° by the Juno polar orbiting spacecraft from 21 June to 10 December 2016. We investigated the occurrence probability of non-Io-related DAM. At 19.5 MHz, as Juno's latitude varies from +15° to −21°, a peak of non-Io-B occurrence probability at 175° System III central meridian longitude (CML) gradually shifts in longitude to 140° CML. Also, another peak occurs at 110° CML between −15° and −9°, merging into the bottom edge of the former peak. This J-shaped feature is similarly seen at 16.5 MHz. Using the Jovian magnetic field models, the fixed hollow cone model can reasonably account for the J-shaped structure for radio sources traced along active magnetic flux tubes onto Jupiter's surface projected at about 135°–149° System III longitude. Moreover, these non-Io-B spectral profiles extend from 13.5 to 23.5 MHz.
CITATION STYLE
Imai, M., Kurth, W. S., Hospodarsky, G. B., Bolton, S. J., Connerney, J. E. P., & Levin, S. M. (2017). Statistical study of latitudinal beaming of Jupiter’s decametric radio emissions using Juno. Geophysical Research Letters, 44(10), 4584–4590. https://doi.org/10.1002/2017GL073148
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