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

Earth and Planetary Astrophysics;Instrumentation and Methods for Astrophysics