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On 2015 February 21, simultaneous observations of Jupiter's decametric radioemission between 10 and 33 MHz were carried out using three powerfullow-frequency radio telescopes: Long Wavelength Array Station One (LWA1) inUSA; Nan\c{c}ay Decameter Array (NDA) in France; and URAN2 telescope inUkraine. We measure lag times of short-bursts (S-bursts) for 105-minutes ofdata over effective baselines up to 8460 km by using cross-correlation analysisof the spectrograms from each instrument. Of particular interest is themeasurement of the beaming thickness of S-bursts, testing if either flashlight-or beacon-like beaming is emanating from Jupiter. We find that the lag timesfor all pairs drift slightly as time elapses, in agreement with expectationsfrom the flashlight-like beaming model. This leads to a new constraint of theminimum beaming thickness of 2.66". Also, we find that most of the analyzeddata abound with S-bursts, whose occurrence probability peaks at 17-18 MHz.

Beaming structures of Jupiter's decametric common S-bursts observed from LWA1, NDA, and URAN2 radio telescopes