Free Access

Fig. 3

thumbnail

Vertical magnetic flux tube model: below 1000 km the Alfvén speed is constant due to the thin flux tube approximation and above 1000 km height the Alfvén speed increases exponentially.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.