ROSES ID: NNH13ZDA001N Selection Year: 2013
Program Element: Solar Dynamics Observatory
Principal Investigator: Graham Barnes
Affiliation(s): NorthWest Research Associates, Inc.
Wagner, Eric L Other Professional NorthWest Research Associates
Summary:The topology of the coronal magnetic field is determined in part by the presence of magnetic null points, making them of fundamental importance in understanding the coronal magnetic field. In addition, the breakout model for the initiation of coronal mass ejections (CMEs) requires the existence of a null point. We propose to model the coronal magnetic field using a Potential Field Source Surface (PFSS) model computed from SDO/HMI vector magnetograms, locate null points in the PFSS model, characterize their evolution, and relate their presence to the occurrence of eruptive events. We will determine the typical lifetime of null points, and how they are formed and vanish in the context of whether they are associated with open field. The high cadence of HMI data will allow for following the evolution of the null points, and for a close temporal association with the start of CMEs, while the full disk magnetograms will allow the global structure of the field to be modeled, and potentially allow for an investigation of the distribution of null points at high latitudes.
|Performance Year||Reference||Investigation Type||Actions|
|1||Barnes, G.; Birch, A. C.; Leka, K. D.; Braun, D. C.; (2014),...||not set|
|1||Crouch, A. D.; (2015), Resolving the Azimuthal Ambiguity in ...||not set|
|1||Barnes, Graham; DeRosa, Marc; Wagner, Eric; (2015), Cha...|