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Morphology of the Jupiter Io-D decametric radio source

    C. HIGGINS, T. E. CLARKE, K. IMAI, M. IMAI, F. REYES, J. THIEMAN

Planetary Radio Emissions VIII, pp. 77-88, 2018/08/14

Proceedings of the 8th International Workshop on Planetary, Solar and Heliospheric Radio Emissions held at Seggauberg near Graz, Austria, October 25–27, 2016

doi: 10.1553/PRE8s77

doi: 10.1553/PRE8s77

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doi:10.1553/PRE8s77



doi:10.1553/PRE8s77

Abstract

Observations of Jupiter’s Io-D decametric radio emissions have been made with the Long Wavelength Array Station 1 (LWA1) from 2012–2015. The LWA1 data show new characteristics in dynamic spectra of Jupiter Io-D emission, including a double–envelope structure filled with spectral arc features, persistent narrowband events, and ubiquitous modulation lanes and S-bursts. We observe an Io-D peak frequency of 26.5 MHz implying a lower limit of 9.3 Gauss for the southern hemisphere magnetic field magnitude. We estimate a Jovian longitude of 235° for the center location of the Io-D peak frequency source. Many S-burst drift rates were measured as a function of frequency and were found to be consistent with other Iorelated sources. The Io-D source occurrence boundaries require new limits: CML = 0° − 287° and ΦIo = 50° − 135°.