Systematic effects

Collected documents/information

documentsdataprovideras of
HMI documents
Various plots (e.g.,data coverage, focus, velocity of the instruments), see readme.txt for detail.
SDO/HMIR. Bush (Stanford Univ.)See link (readme.txt)
SDO/HMI systematicsSDO/HMIS. Couvidat (Stanford Univ.)July 2014
Center-to-Limb Velocity Systematic in Ring-Diagram Anaylysis
Article in ASP conf. proceedings
SDO/HMIB. Greer, B. Hindman, J. Toomre Published in 2013
Multi-Ridge Fitting for Ring-Diagram Helioseismology
Article in SoPh
SDO/HMIB. Greer, B. Hindman, J. Toomre Published in 2014
Ring-diagram analysis paper which includes SDO/HMI systematics info
Article in ApJ, (arXiv)
SDO/HMIR. S. Bogart, C. Baldner, S. BasuPublished in 2015
Paper about the systematics in ring-diagram analysis
Article in SoPh
GONG, SDO/HMIR. Komm, I. Gonzalez Hernandez, R. Howe, F. HillPublished in 2015
Paper "The radial gradient of the near-surface shear layer of the Sun" Article in A&A
(They show some systematic errors went away in high degree f modes and reported that probably HMI splitting frequency data suffers from systematics errors.)
SOHO/MDI, SDO/HMIA. Barekat, J. Schou, L. Gizon Published in 2015
Systematic errors of MDI global helioseismology data
Article in SoPh
SDO/HMIT. Larson, J. SchouPublished in 2015
Paper about systematic center-to-limb variation in time-distance helioseismoogy analysis
Article in ApJ
SDO/HMI, SDO/AIAJ. Zhao, K. Nagashima, R. S. Bogart, A. G. Kosovichev, T. L. DuvalPublished in 2012
Paper showing clear evidence of systematics in splitting data of HMI instrument
“Solar-cycle variation of the rotational shear near the solar surface”
Article in A&A
SDO/HMI A. Barekat, J. Schou, L. Gizon Published in 2016

Contact: Kaori Nagashima (nagashima [at]

Exploitation of Space Data for Innovative Helio- and Asteroseismology