Topical Issue - Space Weather Instrumentation
Open Access
Technical Article

Fig. 5


Download original image

The Spectroheliograph and optical scheme. S = entrance slit; SP = spectrograph; F = interference filters; M = neutral density “moon” translator for prominences; O1 = entrance objective and translator; O2 = collimator; O3 = chamber objective; A1, A2 = historical “arms” with old photographic 13 × 18 cm plate systems.

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.