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.

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hell.confe..21m&link_type=abstract

"5th Hellenic Astronomical Conference, held 20-22 September, 2001 in Crete, Greece. Online at http://www.astro.auth.gr/elaset/he

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from a statistical analysis of Jovian upstream energetic particle ion and electron events, observed by the HI-SCALE instrument onboard Ulysses, during the inbound and outbound trajectory of the spacecraft. A harmonic analysis on the intensity time series of 192 distinct 61-77 KeV upstream ion events, suggests a modulation with a period of ~40 min or ~15-20 min in 48% of the total number of the 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 above periodic modulation was more frequently observed on the out of the ecliptic trajectory (67 events), than on the ecliptic trajectory (26 events). A ~40/ 15-20 min 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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