Abstract Observations of the Interplanetary Magnetic Field (IMF), carried out from October 1990 to February 1992, during the in-ecliptic phase of the Ulysses mission, are presented in this paper. The observations were made between 1 and 5.4 AU, during a different phase of the solar cycle from previous missions. The large scale reorganisation of the solar coronal fields following the maximum in Solar Cycle 22 generated numerous transient events, causing large scale disturbances in interplanetary space, particularly during the first half of 1991. From about the middle of 1991, solar activity apparently decreased, resulting in fewer transient events, allowing the formation of Corotating Interaction Regions (CIRs) recurring in successive solar rotations. Observations of the IMF reflect this temporal evolution in solar activity. However, the average orientation of the IMF, the observed sector structure and the evolution of the CIRs show that the dynamic interaction of transient events with evolving stream-stream structures in this heliocentric distance range results in significant deviations from the expected IMF topology, even when signature of the transients is less apparent. An overview and preliminary analysis of the observations is provided, with special regard to the probable causes and mechanisms of the observed deviations from the ideal Parker model of the IMF.
The interplanetary magnetic field from 1 to 5 AU: Ulysses observations
Advances in Space Research ; 13 , 6 ; 15-24
1993-01-01
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
The Interplanetary Magnetic Field from 1 to 5 AU: Ulysses Observations
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