HAO Colloquium - Shaela Jones, NASA/GSFC

Image-Optimization for Improved Coronal and Heliospheric Magnetic Fields

Knowledge of the coronal magnetic field is key to understanding and predicting conditions in the inner heliosphere; however, measuring this field has proved quite difficult.  Where measurements have been made they have often been limited to small regions of strong field, and are subject to uncertainty due to line-of-sight projection.  In the absence of measurements, solar physicists have created various models for extrapolating the coronal (and ultimately heliospheric) magnetic field from measurements of the field in the photosphere.  

In this talk I will present a brief review of popular methods for modeling the coronal magnetic field and discuss the capabilities and limitations of each, paying particular attention to the difficulties presented by uncertainty in synoptic photospheric magnetograms.  Then I will introduce a method we have developed for improving these models using morphological information derived from images of the lower corona such as those produced by the K-Cor coronagraph.  I will present theoretical tests showing that our image-optimization process can result in significant improvement in the accuracy of the magnetic field model, and I will share recently completed applications of our method using two K-Cor image sets.


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Wednesday, May 9, 2018 - 2:00pm to 3:00pm