“…2); (ii) a broadband noise almost simultaneous with the "36 Hz" line enhancement, extends from the lowest spectral line (6 Hz) to the uppermost one (96 Hz), and even stretches in the VLF range, up to about 1 kHz (not shown here); a second enhancement of the broadband noise only is observed from about 22 km down to the surface; (iii) a small and steady increase of the central frequency of the "36 Hz" line, corresponding to an overall variation of about 1.5 Hz, is seen throughout the descent (Simões et al, 2007a); (iv) the first broadband signal enhancement occurs at about 109 km, about 36 s (∼1.7 km) after the jettison of the main parachute and firing of the stabilizing drogue parachute, and vanishes off at about 80 km, just above the sudden rise of the conductivity layer ( Fig. 3) discovered with the PWA instrument (Grard et al, 2006;Hamelin et al, 2007); (v) the maximum amplitude of the "36 Hz" line occurs between 70 and 105 km; it reaches a surprisingly high input level at the dipole antenna (45 mV rms), which corresponds to a spectral density of some 16 mV m −1 Hz −1/2 for an electric component aligned with the antenna whose effective length is about 1.6 m; the average level lies between 2 and 4 mV m −1 Hz −1/2 throughout the rest of the descent; (vi) the largest fluctuations of the "36 Hz" strength happen when the descent velocity and the tilt angle of the payload with respect to the vertical are the most variable; (vii) no harmonic or sub-harmonic of the "36 Hz" line is clearly identified within the dynamic range of the instrument during the first period; however, a weak but visible second line appears progressively at around 60-66 Hz, more pronounced artificially when it is superimposed on the broadband noise, from about 22 km downwards (Fig. 3); (viii) the second enhancement period of the broadband ELF-VLF noise at around 22 km exhibits a frequency spectrum similar to that of the first one, in shape and strength; the artificial increase at 61 km is due to the abovementioned operation-mode change; contrary to the first event, the variation in broadband noise is not accompanied by any significant increase of the "36 Hz" amplitude.…”