An Assimilative 3-D Model of Coronal Density from Multi-Spacecraft Observations

Details An Assimilative 3-D Model of Coronal Density from Multi-Spacecraft Observations An Assimilative 3-D Model of Coronal Density from Multi-Spacecraft Observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1663k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1663

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques

Scientific paper

White-light coronagraph images observed at different solar rotation angles and from multiple perspectives can be combined to produce quantitative three-dimensional (3-D) reconstructions of persistent, large-scale coronal density. In this work, we present a computationally feasible data assimilation framework for the reconstruction of the time-dependent, 3-D electron density in the solar corona. We present quantitative reconstructions computed from simultaneous dual spacecraft measurements from the Solar Terrestrial Relations Observatory (STEREO) and compare the new time-dependent reconstructions of coronal density to a sequence of static reconstructions. We find that our new dynamic reconstructions are more robust at capturing transient features of the corona and are less prone to computational artifacts that result from the static assumption. The assimilation of STEREO COR1 coronagraph measurements poses some new challenges to conventional solar tomography algorithms. The STEREO data have higher spatial resolution and are measured at higher cadence, with new images available from each spacecraft every 5 to 10 minutes. We comment on the scalability of the data assimilation framework and note its suitability for the STEREO data volume and for the much greater data volume soon to be offered by the Solar Dynamics Observatory.

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