Studying the Heliosphere with Long Time Series of Ulysses HISCALE Ion Composition Data

Details Studying the Heliosphere with Long Time Series of Ulysses HISCALE Ion Composition Data Studying the Heliosphere with Long Time Series of Ulysses HISCALE Ion Composition Data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21b0403t&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21B-0403

Physics

2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2162 Solar Cycle Variations (7536), 2169 Sources Of The Solar Wind

Scientific paper

Ulysses has now been in orbit for fourteen years, over two full orbits and a full solar cycle. We take this opportunity to investigate the properties of long time series of ion composition data that have been acquired by the HI-SCALE instrument. We use daily average H and He fluxes measured by the Wart Pulse Height Analysis (PHA) system of HI-SCALE in the energy ranges of 0.35 MeV/nuc to 1.0 MeV/nuc for He/H ratios, and 0.5 to 2.0 MeV/nuc for species in the Z > 2 composition range from Helium to Iron. Preliminary results show the expected dependence on solar cycle as well as on heliographic latitude of the spacecraft, and S/C distance from the Sun. We show the statistical relationship between He and H fluxes over this entire time interval (and sub time intervals), as well as between Z > 2 ions and He fluxes. In addition, spectral analyses of the ln(He/H) flux ratios exhibit large spectral peaks (above 99% confidence levels at numerous frequencies. All the frequencies reported in the analyses of Thomson et al. (Nature, 1995) in the 0 to 5.8 uHz range are matched within 10 nHz at significance levels above 90% confidence. We suggest that the spectral peaks in the ion fluxes are evidence for the global oscillation (`breathing') of the heliosphere, where the driving source for the breathing is the Sun, i.e., solar oscillations. A 24 nHz fine-splitting visible on many of the lines suggests that the 1.38-year oscillation of the tachocline (Howe et al, Science, 2000) modulates the modes.

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