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Statistical study of latitudinal beaming of Jupiter's decametric radio emissions using Juno
Journal article   Open access   Peer reviewed

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

Masafumi Imai, William S. Kurth, George B. Hospodarsky, Scott J. Bolton, John E. P. Connerney and Steven M. Levin
Geophysical research letters, Vol.44(10), pp.4584-4590
05/28/2017
DOI: 10.1002/2017GL073148
url
https://doi.org/10.1002/2017GL073148View
Published (Version of record) Open Access

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. Key Points A J‐shaped occurrence probability within Jovian non‐Io‐related DAM is found extending over a broad latitude range The fixed hollow cone model can account for the J‐shaped features Complex structures of non‐Io‐DAM are shown in a wide frequency range of 3.5 to 40.5 MHz
 decametric radio emissions Juno Jupiter statistical analysis waves

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