Document details

Title: eHEROES - Sources of CME Material - Presentation to Solar Orbiter 5 Workshop
Authors: WILLIAMS, D. (UCL); BAKER, D. (UCL); VAN DRIEL-GESZTELYI, L. (CNRS)
Abstract: Mass Estimates of Rapidly-moving Prominence Material We present a new method for estimating the column mass (the mass contained within a pixel) of non-fully ionised hydrogen and helium (H I, He I and He II) using the properties of the bound-free photo-absorption cross section at multiple wavelengths. Until now, such estimates have not been reliable with imaging-only techniques, but the near-simultaneity of the images taken by the Solar Dynamics Observatory Advanced Imaging Assembly means that we can now estimate the opacity due to erupting filament material that passes through a previously unobscured patch of Sun. To test this idea, we use data from the spectacular filament eruption that was seen on 2011 June 07, when visual inspection of the erupting material indicated that the material returning to the Sun’s surface was highly opaque. The best-fit maps column density and filling factor reveal both high hydrogen column densities in the centre of this test blob, in line with the higher end of measurements previously made, and suggest that the filling factor of this material approaches unity. The technique converges quickly and we plan to extend it to measuring both the full filament mass and the mass of non-erupting filaments on the Sun.
Insert date: 2013 Jan 30
Uploader: DR_WILLIAMS (1034)
Topics:
corona
filaments
public presentations
Security group: Everyone
File: Williams_Orbiter5Bruges.pdf (5157 KB)