Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31a08p&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH31A-08
Physics
2102 Corotating Streams, 2114 Energetic Particles, Heliospheric (7514), 2164 Solar Wind Plasma, 2194 Instruments And Techniques
Scientific paper
The Ulysses spacecraft has nearly completed two full polar orbits around the Sun. We can now examine the variations of energetic electron and ion spectra as functions of heliolatitude, radial distance, and phase of the solar activity cycle. The key instrumental capability is that of the MF Spectrum analyzer (MFSA) of the Heliospheric Imager Spectrometer and Composition Analyzer (HISCALE). Reporting on this for the first time, we show 25-point energy spectra for protons and Z>1 particle, and 12-point energy spectra for electrons. We has also determined the separately time-varying contributions to the instrumental background from the omni-directional penetrating galactic cosmic rays and from the gamma rays emanating from the spacecraft radioisotope thermoelectric generators. All four of the HISCALE detector heads are used to form a complete set of electron and ion spectra in the solar wind frame in four or eight spin sectors and at four angles to the spacecraft spin axis. Using these spectra, we present the large-scale variations in the energetic particle spectra as functions of latitude, radial distance, and time for both impulsive flare events and recurring co-rotating events (CIRs). The variation of the MFSA observed background rates as Ulysses passed through the streamer belt at ~1 AU as an indication of strong GCR modulation is a secondary result that we will present.
Armstrong Thomas P.
Patterson James D.
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