Concurrent Jovian S-Burst Beaming as Observed From LWA1, NDA, and Ukrainian Radio Telescopes
Abstract
This paper describes the statistical property of Jupiter's millisecond burst (S-burst) beaming for Io-related decametric (Io-DAM) sources from a ground-based radio telescope network. To do so, we performed simultaneous observations of Jovian Io-DAM S-bursts from 15 January through 4 May 2016 for a total of nine events using several radio telescopes. These radio telescopes include the Long Wavelength Array station One (LWA1) in the United States, Nançay Decameter Array (NDA) in France, and three large radio telescopes (UTR2, URAN2, and URAN3) in Ukraine. We conducted a cross-correlation analysis of the S-burst spectrograms in a frequency range of 10.5 to 33 MHz over effective baselines of up to 8,950 km. We found that the beaming of the S-bursts is formed on the flashlight-like structure within an east-west beam width of 2.75" for Io-A/C, 2.63" for Io-A', and 2.75" for Io-B/D. In parallel, the flashlight-like beam was completely filled because the results from all usable pairs of telescopes supported this model. Hence, these beam widths directly correspond to the minimum cone thickness where a radio source emanates over large solid angles from the same direction of Jupiter, as opposed to a localized radio source emitting over small solid angles along active magnetic flux tubes that are tied to Io's orbital motion in Jupiter's rotation frame (beacon-like structure). Additionally, this cross-correlation technique shows a practical benefit of producing statistical profiles of S-bursts.
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