Free Access
Fig. 11

Example of a time-series of Ca ii H spectra taken in July 2010. Left: continuum intensity. Middle: line-core intensity. Right: intensity to the blue of the line core. Exposure time per scan step was 6 s. All images are displayed in logarithmic scale.
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.