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Ulysses Observations at Solar Maximum: Introduction
Smith, Edward J.; Marsden, Richard G.
Observations during Ulysses' second solar orbit reveal basic changes between solar minimum and maximum. Fast high latitude wind disappeared in the southern hemisphere allowing slow wind to expand to all latitudes. In the north polar cap, both fast wind and a polar coronal hole were present. The magnetic field polarity reversal was detected in the …
Low energy charged particles in the high latitude heliosphere: Comparing solar maximum and solar minimum
Lanzerotti, L. J.; Gold, R. E.; Maclennan, C. G.
Low energy charged particles in the global (3-D) heliosphere within ~2.3 AU of the Sun are compared during the two fast latitude scans by the Ulysses spacecraft at solar minimum and maximum. This comparison of data taken by the HISCALE instrument illustrates quantitatively the differences in the population of the heliosphere during the only two so…
Steady-state event-excluded proton spectra at solar minimum at all heliolatitudes
Armstrong, T. P.; Patterson, J. D.
We present spectra of a steady foreground population of particles in the inner heliosphere observed by the Heliosphere Instrument for Spectra, Composition, and Anisotopy at Low Energies (HISCALE) on board the Ulysses spacecraft. The observed spectra come from the full range of heliolatitudes visited by Ulysses, -80 to +80 degrees, during Ulysses' …
Inverse projection method for determination of distribution of real CME latitudes applied to the 1997-1998 SOHO LASCO observations
Skirgiello, Marta
Coronograph observations of coronal mass ejections (CMEs) do not provide the real latitude of their origin. The registered apparent latitude is the projection of the CME trajectory on the plane of the sky, and it may considerably differ from their original location. We show in this paper, how the projection effects can be eliminated from CME latit…
Transition to solar minimum at high solar latitudes: Energetic particles from corotating interaction regions
Forsyth, R. J.; Sanderson, T. R.; Marsden, R. G. +2 more
One of the key questions to be addressed during the solar maximum phase of the Ulysses mission has been the nature of the ubiquitous energetic particle populations observed at all helio-latitudes from equator to poles. During the current, post-maximum phase of its mission, Ulysses has encountered the return to more stable solar wind, high speed st…