Propagation of corotating interaction region
![](https://cdn.sci.esa.int/documents/34817/35562/1567217118246-Cluster_and_Mars-Express_Atmospheres-protected-from-solar-wind_410.gif)
Date: 06 March 2012
Satellite: Cluster and Mars Express
Copyright: ESA
This sequence illustrates the propagation of a corotating interaction region (CIR) from Earth to Mars.
A CIR is a compression region between fast- and slow-moving solar wind streams. In a study carried out by Yong Wei and collaborators, a CIR was used as a 'marker' to pinpoint the same region in the solar wind as it propagated from Earth to Mars.
Last Update: 1 September 2019