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Dynamic spectra of S-bursts of Jovian decametric radiations are obtained by using a high time resolution radio spectrograph
which has a time resolutionof 2 msec and the bandwidth of 2 MHz.Within occurrence of 65 S-burst events observed in the period
from 1983 to 1999, 26 events have been identified as the S-N burst events, which are characterized by the interaction between
the S-burst emissions and the Narrow band emissions. In the dynamic spectra of the S-N burst, the trend of emissions with
negative and slower frequency drift named as “Trailing Edge Emission” are often observed shortly after the appearance of the
S-burst.Detailed analyses of these phenomena revealed that the Trailing Edge Emission is not a manifestation of S-burst with
slower drift rate but a variation ofN-burst. The results suggested that S-burst and the associated Trailing Edge Emission
are formed simultaneously started from a common region with different drift rates. It has been further suggested that the
appearance of the S-burstsis not controlled by the geometrical effect between the source region and theobserver, but directly
reflects the generation of the source region widelydistributed in an altitude range from a few thousands km to 30,000 km,
alongthe Io flux tube.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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