Open Access

Fig. 3.


Download original image

Comparisons of the root mean square errors (RMSE) between the ionosonde B 0 data (27 stations) and the Bilitza et al. (2000) model (Standard), the Gulyaeva (1987) model (Gulyaeva) and the Altadill et al. (2009) B 0 model (SH) for the years 1998–2006. The plot at the top shows the solar activity levels corresponding to each year, the middle plot shows the RSME for B 0 and the bottom plot shows the RSME for B 1 (Altadill et al. 2009).

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.