Free Access
Fig. 2.
Supergranular power spectrum of the divergence signal at the solar equator for both tracking rates, cut at kR⊙ ≈ 123, using one year of HMI data: time-distance helioseismology (left) and local correlation tracking right). Top row: East-west direction. Bottom row: North-south direction.
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.