J
J. Todd Hoeksema
Researcher at Stanford University
Publications - 61
Citations - 4617
J. Todd Hoeksema is an academic researcher from Stanford University. The author has contributed to research in topics: Sunspot & Magnetic field. The author has an hindex of 27, co-authored 61 publications receiving 4257 citations.
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Journal ArticleDOI
The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
J. Todd Hoeksema,Yang Liu,Keiji Hayashi,Xudong Sun,Jesper Schou,Jesper Schou,Sebastien Couvidat,Aimee A. Norton,Monica G. Bobra,Rebecca Centeno,K. D. Leka,Graham Barnes,Michael Turmon +12 more
TL;DR: In this article, the Helioseismic and Magnetic Imager (HMI) active region patches (HARPs) are used to track the location and shape of magnetic regions throughout their lifetime.
Journal ArticleDOI
Evolution of magnetic field and energy in a major eruptive active region based on sdo/hmi observation
Xudong Sun,J. Todd Hoeksema,Yang Liu,Thomas Wiegelmann,Keiji Hayashi,Qingrong Chen,Julia K. Thalmann +6 more
TL;DR: In this article, the authors report the evolution of magnetic field and its energy in NOAA active region 11158 over 5 days based on a vector magnetogram series from the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamic Observatory (SDO).
Journal ArticleDOI
The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
Monica G. Bobra,Xudong Sun,J. Todd Hoeksema,Michael Turmon,Yang Liu,Keiji Hayashi,Graham Barnes,K. D. Leka +7 more
TL;DR: The SHARP data series as mentioned in this paper provides maps in patches that encompass automatically tracked magnetic concentrations for their entire lifetime, including the photospheric vector magnetic field and its uncertainty, along with Doppler velocity, continuum intensity, and line-of-sight magnetic field.
Journal ArticleDOI
The structure of the heliospheric current sheet: 1978–1982
TL;DR: The structure of the heliospheric magnetic field changes substantially during the 11 year sunspot cycle and its configuration for the period 1976 through 1982 using a potential field model was calculated.
Evolution of Magnetic Field and Energy in A Major Eruptive Active Region Based on SDO/HMI Observation
Xudong Sun,J. Todd Hoeksema,Yang Liu,Thomas Wiegelmann,Keiji Hayashi,Qingrong Chen,Julia K. Thalmann +6 more
TL;DR: In this paper, the authors report the evolution of magnetic field and its energy in NOAA active region 11158 over 5 days based on a vector magnetogram series from the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamic Observatory (SDO).