Optimization of Photospheric Electric Field Estimates for Accurate Retrieval of Total Magnetic Energy Injection

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Lumme , E , Pomoell , J & Kilpua , E K J 2017 , ' Optimization of Photospheric Electric Field Estimates for Accurate Retrieval of Total Magnetic Energy Injection ' , Solar Physics , vol. 292 , no. 12 , 191 . https://doi.org/10.1007/s11207-017-1214-0

Title: Optimization of Photospheric Electric Field Estimates for Accurate Retrieval of Total Magnetic Energy Injection
Author: Lumme, E.; Pomoell, J.; Kilpua, E. K. J.
Contributor organization: Department of Physics
Space Physics Research Group
Date: 2017-12
Language: eng
Number of pages: 29
Belongs to series: Solar Physics
ISSN: 0038-0938
DOI: https://doi.org/10.1007/s11207-017-1214-0
URI: http://hdl.handle.net/10138/307526
Abstract: Estimates of the photospheric magnetic, electric, and plasma velocity fields are essential for studying the dynamics of the solar atmosphere, for example through the derivative quantities of Poynting and relative helicity flux and using the fields to obtain the lower boundary condition for data-driven coronal simulations. In this paper we study the performance of a data processing and electric field inversion approach that requires only high-resolution and high-cadence line-of-sight or vector magnetograms, which we obtain from the Helioseismic and Magnetic Imager (HMI) onboard Solar Dynamics Observatory (SDO). The approach does not require any photospheric velocity estimates, and the lacking velocity information is compensated for using ad hoc assumptions. We show that the free parameters of these assumptions can be optimized to reproduce the time evolution of the total magnetic energy injection through the photosphere in NOAA AR 11158, when compared to recent state-of-the-art estimates for this active region. However, we find that the relative magnetic helicity injection is reproduced poorly, reaching at best a modest underestimation. We also discuss the effect of some of the data processing details on the results, including the masking of the noise-dominated pixels and the tracking method of the active region, neither of which has received much attention in the literature so far. In most cases the effect of these details is small, but when the optimization of the free parameters of the ad hoc assumptions is considered, a consistent use of the noise mask is required. The results found in this paper imply that the data processing and electric field inversion approach that uses only the photospheric magnetic field information offers a flexible and straightforward way to obtain photospheric magnetic and electric field estimates suitable for practical applications such as coronal modeling studies.
Subject: Corona, active
Corona, models
Helicity, magnetic
Helicity, observations
Magnetic fields, photosphere
Magnetic fields, corona
LOCAL CORRELATION TRACKING
DYNAMICS-OBSERVATORY SDO
IMAGER HMI
DOPPLER MEASUREMENTS
VECTOR MAGNETOGRAMS
INDUCTION EQUATION
VELOCITY
SUN
AMBIGUITY
HELICITY
115 Astronomy, Space science
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: acceptedVersion


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