Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33c..03h&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH33C-03
Astronomy and Astrophysics
Astrophysics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques, [7599] Solar Physics, Astrophysics, And Astronomy / General Or Miscellaneous
Scientific paper
Since May 2010, the Helioseismic Magnetic Imager (HMI) has made full-disk vector magnetic field measurement of the Sun with a cadence of 12 minutes. The angular resolution is about 1 arc second, corresponding to about 300 km per pixel at solar disk center. Rapid, continuous HMI measurements allow us to follow each small-scale magnetic field element on the photosphere, which will help our understanding of the dynamics in a wide span of space and time. For active regions and sunspots, this temporal and spatial resolution allows us to estimate the energy fluxes passing through the solar photosphere. Those fluxes provide the boundary values for coronal models, such as three-dimensional time-dependent magneto-hydrodynamics (MHD) and magneto-friction simulations and the nonlinear force free field (NLFFF) model. The calculations determine the three-dimensional magnetic field structures and theoretically reproduce their evolution above the photosphere. In principle full-disk coverage of the vector field observations (with low enough noise) can give better determination of the magnetic field near the limb, including the polar field, as well as mitigate artifacts in converting the line-of-sight magnetic field observations to the radial component. The HMI vector data products will help study and answer various long-standing questions in field of solar physics. This presentation provides an introductory review of the HMI magnetic field data products being provided through the JSOC (Joint Science Operation Center, http://jsoc.stanford.edu). Products include the 3-component vector data derived with a fast ME-inversion and disambiguation, inferred inductive flows determined by means of DAVE4VM and ILCT, model results by means of the NLFFF and MHD models, as well as near-real-time space weather products.
Hayashi Kumiko
HMI Vector Magnetic Field Team
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