Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh23a..04t&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SH23A-04
Physics
6218 Jovian Satellites, 7522 Helioseismology, 7807 Charged Particle Motion And Acceleration
Scientific paper
Estimates of the power spectrum computed from the various low--energy ( ˜ 40 - 300 keV) electron detectors of the Ulysses HISCALE instrument were computed on overlapping data segments starting in Jan. 2003 as Ulysses approached Jupiter (closest approach in Feb. 2004) towards the end of Ulysses' second orbit. In addition to the usual low--frequency solar modes expected in this data, a peak at 27.99 μ Hz, corresponding to Jupiter's rotational period of 9h 55m, becomes evident in mid 2003 and, in the last data segment computed in 2003, was about 3.4 σ above the background spectrum. Because relative long, ˜ 170--day, data blocks were necessary for both sensitivity and to resolve Jovian rotation from the nearby 27.435 μ Hz solar mode, it is not possible to give a precise range for the initial detection. It appears that Jovian modulation of the electron fluxes must extend somewhat more than one AU from the planet, further than observed during Ulysses 1992 initial Jupiter pass.
Lanzerotti Louis J.
Maclennan Carol G.
Thomson David J.
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