Quasi-periodic emissions (15-80min) from the poles of Jupiter as a principal source of the large-scale high-latitude magnetopause boundary layer of energetic particle

Details Quasi-periodic emissions (15-80min) from the poles of Jupiter as a principal source of the large-scale high-latitude magnetopause boundary layer of energetic particle Quasi-periodic emissions (15-80min) from the poles of Jupiter as a principal source of the large-scale high-latitude magnetopause boundary layer of energetic particle

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004p%26ss...52..543k&link_type=abstract

Planetary and Space Science, Volume 52, Issue 5-6, p. 543-559.

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Quasi-Periodic Emission, Magnetopause Boundary Layer, Jovian Particle Dynamics

Scientific paper

In this study, we concentrate on the examination of the quasi-periodic behavior of 0.5-1.6MeV (~40-400keV) protons (electrons) and of relativistic (>16MeV) electrons, observed at Jupiter by two different experiments onboard Ulysses, the HI-SCALE and COSPIN, respectively, within the large-scale south duskside magnetopause boundary layer (MPBL) of energetic particles, from ~20:00UT, day 41, to 12:00UT, day 43. During those times, the observations confirm the transition of Ulysses to an important magnetospheric region with particle intensities comparable to the magnetodisk levels. A careful analysis of high time-resolution intensity, anisotropy and spectral measurements suggests the following: (1) The quasi-periodic ~40min (QP-40) energetic electron (>~40keV) and proton (>~0.5MeV) emissions from the south pole were a characteristic phenomenon in the south duskside MPBL; an almost continuous QP 40-min variation has been confirmed in energetic electron observations. (2) When the QP-40 modulation was not evident in energetic particle intensities, it was still detectable in spectral and anisotropy observations. (3) The QP-40 emission is a principal, but not the only periodic, energetic electron and proton emission; other periodicities (~15,~20,~30,~50,~60,~80min) were also significant in energetic particle spectral and anisotropy observations. We infer that QP-40 emissions along with other periodic emissions (~15,~20,~30,~50,~60,~80min) were the principal source of the large-scale high-latitude MPBL of energetic particles during Ulysses outbound pass of Jupiter.

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