Other
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.4767g&link_type=abstract
Journal of Geophysical Research, vol. 103, p. 4767
Other
7
Ejecta, Solar Wind, Space Plasmas, Ulysses Mission, Mach Number
Scientific paper
We identified the ejecta detected by Ulysses during its voyage to Jupiter using bidirectional streaming of suprathermal electrons accompanied by other plasma cloud signatures. This data set of 34 ejecta at low latitudes complements previous statistical studies of ejecta and transient forward shocks (TFS) within 1 AU and allows us to study their heliocentric evolution from 1 to 5.4 AU. We used solar wind plasma data to analyze dynamic aspects of these events. In general, ejecta associated with TFS and ejecta without shocks had similar characteristics. However, ejecta associated with TFS had fronts propagating faster than the ambient solar wind, while ejecta not associated with shocks had fronts propagating at about the same speed as the ambient solar wind. The ejecta radial width did not present a clear statistical tendency to expand with heliocentric distance, and the ejecta mean flux density did not decrease more quickly than the square of the distance from the sun. These two results might suggest that the rate of expansion of ejecta from 1 to 5 AU is less than the rate of expansion within 1 AU. However, a limitation of this analysis is the ambiguity of comparing ejecta parameters that can vary depending on different aspects and with heliocentric distance. Only about 40 percent of the ejecta associated with TFS had leading edges propagating supermagnetosonically with respect to the ambient solar wind.
Américo González-Esparza J.
Neugebauer Matthias
Phillips John Lynch
Smith Edward. J.
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