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Fig. 3

image

Example of NDA routine dynamic spectra (tf displays) and emission contours drawn when building the catalog. The timescale is in UT of the day of Jupiter’s passage at the local meridian (i.e., if transit occurs at 01:00, data is recorded from –3 h to +5 h, whereas if transit occurs at 22:30, data is recorded from 18:30 to 26:30). a) Dynamic spectrum in LH and RH polarization of an observation recorded on 07/08/1999. Three types of Jovian emissions are detected: an LH (Io-C) and two RH emissions (Io-A and Io-A′′) with weak or no counterparts in the opposite polarization. Hourly calibrations, various interference, and high-pass filter switch-on at 05:30 are clearly visible. b) Dynamic spectrum in LH and RH polarization of an observation recorded on 06/01/2015. The Io-D has LH elliptical polarization (as deduced from the “ghost” in RH polarization) and a peculiar tf shape.

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