Abstract
The stream interaction region (SIR), formed when a fast stream overtakes a preceding slow stream, is the predominant large-scale solar wind structure at this early phase of the STEREO mission. Using multi-spacecraft observations from STEREO A and B, ACE, Wind, and Ulysses in 2007, we analyze three stream interaction events in depth in May, August, and November of 2007, respectively, when the spacecraft had quite different spatial separations. We attempt to determine the causes of the differences in the SIR properties, whether they are spatial or temporal variations, and also to examine the steepening or widening of the SIR during its radial evolution. The presence and characteristics of associated shocks, the relation to the heliospheric current sheet, and other structures are also studied.
Highlights
Since slow and fast streams originate in different regions on the Sun at different times, they are threaded by different magnetic field lines and are prevented from interpenetrating (Gosling and Pizzo, 1999)
We investigate in depth one representative stream interaction region (SIR) observed by multiple spacecraft near 1 AU as follows
The May and November events demonstrate that the solar wind parameters across the SIRs can have surprisingly similar amounts of variations, whether the spacecraft were separated by 7° or 42° longitude
Summary
Since slow and fast streams originate in different regions on the Sun at different times, they are threaded by different magnetic field lines and are prevented from interpenetrating (Gosling and Pizzo, 1999). Keywords Solar wind · Stream interaction · Shock · Multi-spacecraft observation
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