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Fig. 1

image

Dynamic spectrum with LOFAR LBA of Jupiter in Obs #1 in Stokes-I (panel a) and Stokes-V (panel b) and of the OFF-beam 1 in Obs #2 in Stokes-I (panel c) and Stokes-V (panel d). In Obs #1, we only show the data from 15 to 30 MHz because there was no emission of Jupiter occurring above 30 MHz. The Stokes-I observations (panels a and c) are divided by an average value of the background at each frequency, whereas the Stokes-V observations(panels b and d) are subtracted by an average background. As seen in panel b, the emission around 2.5–3 UT has negative (right-handed) circular polarization and most of the other emission has positive (left-handed) circular polarization.

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