Open AccessThe presence of a systematic error in SDO/HMI data
Author(s) -
G. V. Rudenko,
G. V. Rudenko,
I. S. Dmitrienko,
I. S. Dmitrienko
Publication year - 2018
Publication title -
solnečno-zemnaâ fizika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2412-4737
DOI - 10.12737/szf-42201801
Subject(s) - systematic error , physics , magnetic field , knot (papermaking) , observatory , standard deviation , astrophysics , vector field , computational physics , statistics , mathematics , mechanics , quantum mechanics , chemical engineering , engineering
In this paper, we came to the conclusion that there is a systematic error in SDO/HMI (Helioseismic and Magnetic Imager aboard the Solar Dynamics Observatory) vector magnetic data, which reveals itself in a deviation from the radial direction of the knot mag-netic fields manifesting themselves on magnetograms in the form of small grains in a strong magnetic field. This deviation demonstrates a dependence on the distance to the disk center, which cannot be a property of the magnetic field – it can only be artificially introduced into the data. We suggest a simple method for correcting vector magnetograms, which eliminates the detected systematic error.