An artist’s rendition of the Parker Solar Probe approaching the Sun. Astronomers have used data from Parker, along with data from other solar missions, to detect and study Solar stream interactions. Credit: NASA/Johns Hopkins APL/Steve Gribben
When a fast solar wind stream erupts from a coronal hole (a cooler region in the Sun’s atmosphere) and overtakes a slower moving solar wind stream, a stream interaction region (SIR) can form. In the SIR, a density “pileup” of compressed plasma develops upstream of the interface; typically there is a peak in pressure followed by a rarefaction region in …
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