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Fig. 14

image

Dynamic spectra of typical Io-DAM arcs. The entire frequency range (10–40 MHz) is shown. The circular polarization and the date (YYYYMMDD) are indicated on the top of each plot. Abscissa is the time (hours UT) of that day (see the convention for date and time in the caption of Fig. 3). The intensity scale (increasing darkness) is in dB above the background to the right of each plot. Each emission component is identified by a thick polygonal contour and the corresponding emission type above it. Dark vertical lines separated by one hour are calibration sequences (see Sect. 2 and Fig. 3). We selected examples with typical shapes in the tf plane. In some cases (19950509, 19990807), different RH and LH emissions are detected on the same day and overlap in time, each appearing dominant in the dynamic spectrum of corresponding polarization.

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