Superfine Structure of Jovian Millisecond Radio Bursts

Details Superfine Structure of Jovian Millisecond Radio Bursts Superfine Structure of Jovian Millisecond Radio Bursts

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh23a..05r&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SH23A-05

Astronomy and Astrophysics

Astronomy

6220 Jupiter, 6939 Magnetospheric Physics, 6954 Radio Astronomy, 7807 Charged Particle Motion And Acceleration, 7871 Waves And Instabilities

Scientific paper

Jupiter decameter (DAM) radio emission mainly consists of wide-band radio storms with time scales in seconds (L-bursts) and milliseconds (S-bursts), the latter comprising a series of short pulses with duration of a few to tens of milliseconds, and strongly controlled by the satellite Io. First in-depth analysis of the subpulse structure was made by Carr and Reyes (1999) with the discovery of successive deep envelope modulations, with time resolution better than 30 microseconds, and during these subpulse periods the discovery of phase coherence. Recent observations by means of the newly developed waveform receiver (at present unsurpassed in spectral resolution) and connected to the decameter world-largest radio telescope UTR-2 (Kharkov) yielded waveform measurements of Jovian S-bursts which have been analyzed by the wavelet analysis method. Main outcome of the present investigation is the detection of clear signatures of microsecond modulations, providing evidence of a superfine burst structure with the following parameters: a) instantaneous frequency band of one separated microsecond pulse of 100 to 300 kHz, b) time duration of one separated micropulse of 6 to 15 microseconds, and c) time interval between closest subsequent microsecond pulses of 5 to 25 microseconds. The apparent frequency drift of a millisecond burst evidently results from sequentially decreasing frequencies of subsequent subpulses, each representing an island of phase coherent gyrating electron bunches.

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