One of the interesting features of the Sun & Heliosphere are “Co-rotating Interaction Regions” (CIR’s) or counter-streaming electrons heading sun-ward:
… the transition through the boundary between the two regions that tends to cause the most dramatic effects…
This boundary - where the flow speed and magnetic field direction both change abruptly - is known as a "corotating interaction region" or CIR. When Earth encounters a CIR, as it did on Monday night, the "shock" of the transition from one region to the other stirs up the magnetic field around the planet, causing it to fluctuate, sometimes in unpredictable ways. This can dump a significant amount of energy into Earth's magnetosphere, which can result in strong geomagnetic storms. – The Weather Network
Apparently tracked CIR’s were caught interacting with 67p as well (four times):
Four corotating interaction regions (CIRs), where the first event has possibly merged with a coronal mass ejection, are traced from Earth via Mars (using Mars Express and Mars Atmosphere and Volatile EvolutioN mission) to comet 67P from October to December 2014. – Solar wind interaction with comet 67P: Impacts of corotating interaction regions
You have to wonder if these (CIR) counter-streaming electrons might be responsible for some of the unexpected flare-ups while comets heading back out of the solar system.