Search Publications
Corotating interaction regions
Heber, B.; Zhang, M.; Sanderson, T. R.
Corotating Interaction Regions are long lasting large-scale plasma structures generated in low and middle latitude regions of the heliosphere by the interaction of a stable fast solar wind stream with the surrounding slow solar wind. Associated with these plasma structures are recurrent MeV-ion events and recurrent decreases of the galactic and an…
On the gradients of ACR oxygen at intermediate heliocentric distances: Ulysses/Soho results
Torsti, J.; Sanderson, T. R.; Marsden, R. G. +3 more
During 1997 and up to the present time, the heliocentric position of the Ulysses spacecraft has changed only slowly in distance and latitude, being close to the equator at a distance of ~5 AU. This period provides an excellent opportunity to observe the evolution of the Anomalous Cosmic Ray (ACR) spectrum at a location intermediate between 1 AU an…
Implications of the heliospheric modulation of cosmic ray electrons observed by ulysses
Ferreira, S. E. S.; Potgieter, M. S.; Heber, B. +2 more
The results of a moderate drift model with anisotropic perpendicular diffusion for the heliospheric modulation of galactic cosmic rays were compared with electron spectra observed by the Kiel Electron Telescope on board the Ulysses spacecraft for four distinctive periods, 1992, 1995, 1996, and 1997, respectively, for relative large solar activity …
Latitudinal and radial variation of >2 GeV/n protons and α-particles in the northern heliosphere: ulysses cospin/ket and neutron monitor network observations
Kunow, H.; Bothmer, V.; Wibberenz, G. +10 more
Ulysses, launched in October 1990, crossed in December 1997 the heliographic equator and completed its first out of ecliptic orbit. During the time period from February 1995 to November 1997 solar activity was low and the spacecraft scanned the latitude range from 80° N to the heliographic equator. The Kiel Electron Telescope on-board Ulysses meas…
Studies of the cosmic ray radial and latitudinal intensity gradients over the cycle 22 solar minimum period
Kunow, H.; Wibberenz, G.; Heber, B. +7 more
The spatial intensity gradients of galactic and anomalous cosmic ray helium are studied over the 1993.0-1998.0 time period using data from cosmic ray experiments on IMP 8, Ulysses, Voyagers 1 and 2 and Pioneer 10. When combined with the results of previous studies, a remarkable ordering of the radial gradients for the galactic component is found o…