Abstract
In determining the characteristics of prominence motion with the spectroheliograph the question of the possible deformation of the images by radial velocities of the internal structure is always present. This is of peculiar interest in prominences of the eruptive class. In the design of the spectroheliograph of the tower telescope at Lake Angelus we have included means whereby the chromospheric line used to make the photographs may be shifted a known amount from the second slit. This is done by observing an emission line of mercury or neon produced by a fixed slit and observed with a microscope. To test the effect of a shift on the form of a prominence the line was thus artificially displaced 1 A to the violet, then 1 A to the red on pairs of successive exposures (frames) of the motion-picture camera at intervals during the eruption. If any large radial velocities were present they would appear as changes in the prominence structure which these frames reveal.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Publications of the Astronomical Society of the Pacific
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
