Periodic signals in Ulysses' energetic particle events upstream and downstream from the Jovian bow shock

Details Periodic signals in Ulysses' energetic particle events upstream and downstream from the Jovian bow shock Periodic signals in Ulysses' energetic particle events upstream and downstream from the Jovian bow shock

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001p%26ss...49.1031m&link_type=abstract

Planetary and Space Science, Volume 49, Issue 10-11, p. 1031-1047.

Computer Science

4

Scientific paper

We present results from a statistical analysis of energetic particle events, observed by the Heliosphere instrument for spectra, composition, and anisotrophy at low energies (HI-SCALE) instrument onboard Ulysses, upstream from the bow shock of Jupiter, during the inbound and outbound trajectory of the spacecraft. A harmonic analysis on the intensity time series of 192 distinct 61-77keV upstream ion events, suggests a modulation with a period of ~40min or /~15-20min in 48% of the total number of events, at the significance level of /P=0.05. In some cases, the periodicity is not significant in the ion intensities, while it is significant in the ion anisotropy and/or spectral data. Our analysis shows that the periodic modulation was more frequently observed on the out-of-ecliptic trajectory (67 events), than on the ecliptic trajectory (26 events). An /~40/15-20min periodicity was also found in energetic ion and electron events in the magnetosheath. The results from the statistical analysis of HI-SCALE measurements are consistent with a magnetospheric source for the majority of the upstream events. The statistical results are also consistent with preferential leakage of energetic ions from the south high-latitude Jovian magnetosphere.

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