The PDFI_SS Electric Field Inversion Software

Abstract

We describe the PDFI_SS software library, which is designed to find the electric field at the Sun's photosphere from a sequence of vector magnetogram and Doppler velocity measurements, and estimates of horizontal velocities obtained from local correlation tracking using the recently upgraded FLCT code. The library, a collection of Fortran subroutines, uses the "PDFI" technique described by Kazachenko et al. (2014), but modified for use in spherical, Plate-Carrée geometry on a staggered grid. The domain over which solutions are found is a subset of the global spherical surface, defined by user-specified limits of colatitude and longitude. Our staggered-grid approach, based on that of Yee (1966), is more conservative and self-consistent compared to the centered, Cartesian grid used by Kazachenko et al. (2014). The library can be used to compute an end-to-end solution for electric fields from data taken by the HMI instrument aboard NASA's SDO Mission. This capability has been incorporated into the HMI pipeline processing system operating at SDO's JSOC. The library is written in a general and modular way so that the calculations can be customized to modify or delete electric field contributions, or used with other data sets. Other applications include "nudging" numerical models of the solar atmosphere to facilitate assimilative simulations. The library includes an ability to compute "global" (whole-Sun) electric field solutions. The library also includes an ability to compute Potential Magnetic Field solutions in spherical coordinates. This distribution includes a number of test programs which allow the user to test the software.

68 pages, 28 figures, 3 tables. This version (arXiv) will be updated when major changes to the software occur

References in corpus (26)

• Astropy: A Community Python Package for Astronomy
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
• Tracking Vector Magnetograms with the Magnetic Induction Equation
• A Method for Data-Driven Simulations of Evolving Solar Active Regions
• SunPy - Python for Solar Physics
• Obtaining Potential Field Solution with Spherical Harmonics and Finite Differences
• What is the relationship between photospheric flow fields and solar flares?
• Modeling the Dispersal of an Active Region: Quantifying Energy Input into the Corona
• A Comprehensive Method of Estimating Electric Fields from Vector Magnetic Field and Doppler Measurements
• The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Model the Buildup of Free Magnetic Energy in the Solar Corona
• Estimating Electric Fields from Vector Magnetogram Sequences
• Photospheric Electric Fields and Energy Fluxes in the Eruptive Active Region NOAA 11158
• The PDFI_SS Electric Field Inversion Software
• A Magnetic Calibration of Photospheric Doppler Velocities
• Radiative Cooling in MHD Models of the Quiet Sun Convection Zone and Corona
• Simulating the Coronal Evolution of AR 11437 using SDO/HMI Magnetograms
• Optimization of Photospheric Electric Field Estimates for Accurate Retrieval of Total Magnetic Energy Injection
• Can we Determine Electric Fields and Poynting Fluxes from Vector Magnetograms and Doppler Measurements?
• Achieving Consistent Doppler Measurements from SDO/HMI Vector Field Inversions
• Analysis of Flows Inside Quiescent Prominences as Captured by Hinode/Solar Optical Telescope
• Determining the Transport of Magnetic Helicity and Free Energy in the Sun's Atmosphere
• Probing the effect of cadence on the estimates of photospheric energy and helicity injections in eruptive active region NOAA AR 11158
• Data compression for local correlation tracking of solar granulation
• Sparse reconstruction of electric fields from radial magnetic data
• Deriving Potential Coronal Magnetic Fields from Vector Magnetograms

Cited by in corpus (18)

• SMARPs and SHARPs: Two Solar Cycles of Active Region Data
• The PDFI_SS Electric Field Inversion Software
• The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
• Thermodynamic and Magnetic Topology Evolution of the X1.0 Flare on 2021 October 28 Simulated by a Data-driven Radiative Magnetohydrodynamic Model
• Data-Driven Radiative Magnetohydrodynamics Simulations with the MURaM code
• Hybrid data-driven magnetofrictional and magnetohydrodynamic simulations of an eruptive solar active region
• Probing the effect of cadence on the estimates of photospheric energy and helicity injections in eruptive active region NOAA AR 11158
• Formation of Quiescent Prominence Magnetic Field by Supergranulations
• MHD simulation of Solar Eruption from Active Region 11429 Driven by Photospheric Velocity Field
• An Evolution and Eruption of the Coronal Magnetic Field through a Data-Driven MHD Simulation
• Efficient magnetohydrodynamic modelling of the time-evolving corona by COCONUT
• Validation of the PDFI_SS method for electric field inversions using a magnetic flux emergence simulation
• Buildup of the Magnetic Flux Ropes in Homologous Solar Eruptions
• Data-driven Radiative Magnetohydrodynamics Simulations with the MURaM Code: the Emergence of Active Region 11158 and the X2.2 Flare
• Multi-height probing of horizontal flows in the solar photosphere
• Data-driven Radiative Magnetohydrodynamics Simulations with the MURaM Code: Coronal Heating and Dynamics in an Emerging Active Region
• Dependence of the intensity of the nonwave component of EUV waves on coronal magnetic field configuration
• Supergranulation and Poleward Migration of the Magnetic Field at High Latitudes of the Sun