Statistical study of latitudinal beaming of Jupiter's decametric radio emissions using Juno
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Abstract
Abstract 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.
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